Does his ability 2-,3-,4- then boost mean

2 turns and 3 turns

Or just

2 3 4 straight

Any 2-3- or 4 speed move means just that. Any move that has the number 2, 3, or 4 as its speed. Including the K turns and Tallon Rolls if you have Primed Thrusters equipped.

Okay, I felt like I was all over the place and it felt like I had a huge advantage

Snap, Flight assist astromech, intensity,

I was using advanced optics just so I could have that focus token saved, get my evade from intensity, get into position then target lock.

But primed thrusters seems pretty nasty too

He's very, very nimble, but in the end, he's still only PS6, so he can't make THAT much use of it.

I get the extra action for the TL from AP5.