I've noticed a lot of inconsistency with the evasive maneuvers power, it does work quite well normally however sometimes I've noticed it do nothing at all, and other times I've activated it its propelled my ship way faster than full impulse (its great for escaping 3+ Negh'var's when it does that..lol)

Not sure if thats working as intended or its bugging out.

one time it turned me away from disruptor fire into 2 torpedo shots

It doesn't turn you, it just boosts your turn radius and defensive stats temporarily. You turned yourself into those torpedos, just at double quick pace

It also boosts your speed for 8 secs and stacks with full impulse

Didn't realise it stacked, good tip!

Yep its a good power when it works as intended A few times in combat I've activated it and its essentially acted like a mini-warp lol, sometimes its good for escaping and other times when I just want to turn fast to throw down a torp volley its launched me 10-20km away from the battle lol.