Ha ha gratz OP !!!
I was kind of in the same boat or almost, like a few weeks ago. I could only complete Lorta/Hypori, New Cov/Kanz and Regnant/far Craddle, and even then it took me a while to learn them.
But really I was at a point I thought I'd never ever be able to finish the last 3... Eventually I did persevere, after a week break, and tried to see where I'd have to place the EWP and EMP, and most of the time, for those 3 missions there are "mandatory" moments... I mean : right off the bat using both EWP and EMP during Baros/Duma ? After I tried that it went sooooooo much smoothly ha ha !!!
Now am happily doing all 6 with 6 different toons (lol) and really enjoying them... Funnily the one that I completed 4th (with all the bombers, Ardis/Kabal is it ?) thinking I could never ever complete the 5th (Baros/Duma) and 6th (Thanium/Cha Rabaa), at the time, is now the one am still failing here and there.
(oh lol : this morning I failed Lorta twice btw...)
Also I can't use the WASD thing because am on a a keyboard that isn't setup like english keyboards...
So for me it's only mouse and space bar for movement.
About what Kitru said earlier about the barrel roll
, while am at it :
It does do something, it's just a little lateral speed boost, kinda like the WASD moves except it doesn't place you back when you release the key : hope it makes sense.