I saw a firndly xt missi,e tank vs an enemy gunlogi ion cannon tank
The guy did no damage, missiles need fixing...

Did somebody say MISSILES?

Well I watched your video. The hit and run tactic is definitely something that you need to consider as a Missiler. Especially with that fit you've got going on. There's nothing wrong with outputting tons of damage, and this may just be where our play styles differ, but I run a more survival shield-focused fitting.

Funnlogi
AT-201*
Complex Shield Hardener
Complex Shield Booster
Enhanced Damage Mod
Militia PG Upgrade

With this fit you can still output plenty of extra Damage with one Dmg Mod, and you have that nice fallback with the Booster if your shields fall too low or if a Rail Gun unexpectedly thumps you from a mile away.

I also noticed how you shot at those Dropships. Instead of just full autoing it, fire in aimed bursts and make sure you lead enough.

I recommend never ever relying on splash to take down infantry, try to get direct shots. With enough practice you'll be able to down a sprinting target from 100m away with only one or two or no misses. You'll usually one-shot most suits except Heavies, bricked out suits and some shield tanked suits.

*You could use an XT-201, but you'll need to add a CPU Upgrade and switch out the MLT PG Upgrade for a Basic or something like that. I use the AT-201 because money reasons.

At the same time they way to powerful vs armor i mean yes they should kill armor tanks easy but not that easy

Missile Tanks are the throwaway guns of the tank world. They are very effective against Armor at close range and best used when they get the drop but fall short at anything else; they are best used doing the one murder and discarded.