I approve of this.

While I approve of this so far, here are two things that bug me:
STD-ADV-PRO "Heavy" plates are imbalanced between themselves.
The STD plate costs barely anything CPU/PG wise but give so much HP.
ADV is middle of the road.
Nobody uses PRO.


I think STD and ADV "heavy" plates need a PG cost increase.

---

The second thing is that you're going to swap the Gallente and Amarr module slots.
That's BAD, the Amarr are going to get an extra low slot, evidenced by the light and heavy frames.

Another change:
I would increase the HP on both reactives and ferroscale plates further, just a tad, an extra 10-20HP each.

Using basic plates + armor reppers will still be better than using complex reactives.

Updated :
I've add the fact than STD and ADV plate should cost a little more PG/CPU.
And added 10 more base HP (20 is too much) to all plates (then calculated with skills for new numbers)

Amarr and Gallente MUST swap their slots, Amarr is supposed to Brick tank better than Gallente, it's impossible for him with less slots than a Gallente, Gallente must make more damage than Amarr, it's impossible for him witohut these High slots.
This is simply PURE logic here.
This is only for Sentinel and STD commando's.
YES Amarr is going to get an extra low slot BUT they lose an High slot.


Edit: Have checked all the slots, was thinking with the OLD slots values....My bad.
In fact everything seems okay.
Just problem for :
Sentinel (Amarr is too dual tanking/damage and Gallente is too brick tanking oriented.)
Commando STD, Amarr and Gallente need to swap slots. (ADV and PRO have same slot layout)

I agree that advanced and proto "standard" plates should have a higher speed penality ( maybe 4 and 6%) and reactive & ferro-fibrous plates needs lower fitting/a buff.

But such changes will do nothing to chance armor stacking, for the simple fact that you can't active tank in dust.

In eve i can set up my gallente ships so that they can tank the most (sometimes even all) the dps of one (sometimes even 2) evemy ship(s) as long as you have capacitor (my 3 repper myrmidon tanked 4 ships long enough to let me run once in a wormhole).

We can't do anything like that in dust.
I can stack 3 complex armor reppers and i'll just die because the dps of the weapons is HUGE compared to the amount of hp gained from reppers, the Ar have some 3-400 dps, 4 complex reppers will repair 25hp/s. That means my 3-400armor hp suit (i got reppers in the lows bro!) will die in 1-2 seconds.

Repair tanking in DUST is different from EVE.
Repair tanking requires you to do skirmish warfare, using cover and mobility to make sure the enemy has no time to get back on his feet, so to say.

I already created some theoretical fits, this will be more than possible with his suggestions.