What machine you using and is it a polishing or compounding pad?
If it a da you are using meguiars 105 on a orange hex logic pad followed by 205 on a white hex pad is a good choice.
If its a rotary i prefer to use Menzerna compounds(Cant remenber their numbers) in stages on a orange, then white then finishing off on a black pad.
From what i understand meguiars UC is very similar to 205 so really is only good for finishing.