What's your profile dampening at?
Do you have proficiency knives using ishnoks( you said 300 damage ishnoks are 200/ had to ask, proficiency level?)
Do you have minmatar racial suit bonus?
What's your speed?
What's your sensitivity settings? I lowered mine to 20 left right an 10 up down big difference!
Have you de fragged your ps3 lately?
Do you hit them once they stop moving?
Do you stalk them?
I run shields knives complex red an a enhanced armor repair an flux nades with my sensitivity low to not miss a quick strafer.
I found the new build doesn't allow the manic slashing without a charge, Because the knives have a delay now.
Press your swing an see if the knives react instantly. They don't they wait almost 1second because they auto matically begin to charge, you have to incorporate this to your style. Also the hight opponent strafe speed means that one second delay often means you only get em with one blade. Plus their movement doesn't always register that an our endurance now has a delay .
So use the armor repair an complex red. You'll run 9.36 but the enhanced repair an a scouts quick shield recharge will keep you at almost full health if you get hit an hide behind a box , they see you two seconds later an your health is full again , use the flux to stall. When you chuck the first nade they don't know what kind it is so you by time to get your endurance an shield up, throw another an run, circle stalk and kill this strategy work well because they don't know your back to full health an they abort thinking your not coming back for seconds an that's when you get them.
Stalk wait for their endurance to make them walk , sprint kill.
Adjust your settings in sensitivity de frag the ps3 an try my style see if it works, get at me tonight I'll be able to squad in about 8 hours

Last night I got 4 red line snipers in a row sharing a nano hive with a cheap militia fit for those redline untouchable s it was worth the suicide just if I coulda seen all 4 of there faces when it said OZAROW NOVA KNIVES ON THEIR KILLED CHART LMAO

So what level is your suit at?
Armor an shield upgrades an enhancement?
Armor repair?
Biotics regulation endurance an have you unlocked kinetics?
Profile dampening?
Your scout is a armor tanker but you can use those low slots to a wicked advantage if you spent the sp correctly .
But the play style is different for a few reasons.
You can be faster but then you run no armor speed mods 3 an armor rep an a complex shield
Or two reds armor rep an a green
Or two armor reps basic plate an speed
Or profile damp 2 an speed an armor rep
All of these styles with a shield
But now you have nearly any shield an any time you get hit you ll always lose armor so you need a wicked armor repair always on so it act like your shield regen. So you have 2 things healing you at all times so get that complex armor rep ASAP !
I went mini scout because gallente needs mor things unlocked to be successfull
Armor basic maybe enhance ( for shotty use) but deffinetly armor upgrades 5 for the 5% per level mine is shields so everything I skilled would be similar but almost backwards. But you need a complex shield in the frontjust to fill one space which feels like wasted sp unles you went shield energizer so even tho its a low shield it's aways up. But because your pg side will take a lot of power for the 4 slot proto u need engineering an circuitry high lv 5 if possible.
The gallente will never have the speed or movement of a mini unless u use 3 complwx kin but you'll run out of stamina faster but since its armor you need fast armor reps on your suit so it works like a minis shield.
So if you have armor upgrades 5 an shield up grades 5 you can have extention at level one an have your stock armor higher without a armor mod so you don't lose mobility or speed and put a complex shield in the front an complex armor rep an 3 speed mods in the back run like snot an always have full health in seconds to escape when trapped.
An with full pg CPU you can have two weapons cuz your CPU an pg stock is higher than minmatar.
But before you spec further spend the 20 thousand sp on a minna tar light basic an test drive its mobility because if you haven't gone galente racial yet it might be worth it to change suits if it fits your play style better.
For uprising I went gallente then regretted it an was lucky to get the optional respec.
I went mini proto racial 5 nk proficiency3 , shotgun proficiency 3 , dampening 4, endurance 5 cardiac3 , kinetics,5
A shield upgrade an extention5 CPU pg 2 took about 9 million sp.
Not sure how much you have but that's a good knifed guideline on how to spec.
Since then I now have more weapons an an a basic level 3 gallent scout, minmatar middle frame 3 an a basic gallente assault trying to make a stronger knifer with more hp for shields since I had the same knife problems as you.
But then I went bac to my winmatar scout put armor rep on it so I didn't over pass my prey , cleaned my ps3, an lowed my sensitivity an hunted differently mind you some battle aren't good for scout but now I have a tough advanced minmatar medium frame to slap speed mods a proto short an armor rep on an it makes the scout sp spent wor for that build , but not so much anything else cuz the minmitat medium is like second best movement an sprint next to scout so it made sence.
So try mini scout before you dump more into gallente.
Hope the novel helps