Soren would you believe me if I said I could beat Andross without even taking a hit?
I completely admit that the stick to U-Turn and Summersault can be really frustrating because maybe you want to boost but you perform tricks instead and miss your target.
Advice for Andross:
1) Use the First Person view to find the blue entrances of course. Don't fly into them, land on the ledges with the walker and drop in.
2) Don't fly with the Arwing around Andross.
3) When he raises his fist to punch or clap shoot his weak point for a few seconds and then RUN don't fly to one end of the arena.
4) You'll be facing a wall when you run to the opposite side, use ZL targeting or U-Turn input to turn the Walker around instantly. Sometimes you will want to turn the walker with the R Stick and regrettably in the heat of the moment it will do a barrel roll
5) Once you destroy a hand, don't try to get that double laser, just fly out a window immediately.
6) Andross will shoot lasers all over the arena. Fly towards the camera(the Arwing facing you in the TV) and just lightly push up and down to avoid the lasers. They are extremely difficult to avoid if you are flying along side the arena or using the First Person view.
7) Fly back in a hole and keep an eye on where that double laser is. Either get it as you drop in as a Walker or don't get it at all unless you know you have enough health to take the tractor beam hit.

Still no need to fly, run/boost away from his attacks.
9) When he sucks you in use your bombs to get him off you quickly. Aiming with the laser is hard but thats the only other way.
10) Once his hands are destroyed don't fly around. Just do 2 or 3 barrel rolls do dodge his head rush attack and spit panels.
11) Shoot him in the glowing parts and when he is dizzy now feel free to fly to the opposite side or run to hit the sore on the back of his head.
I'm telling you it can be done without getting touched. Well the tractor beam is one that is really hard to avoid.