When I played SRB2 one thing that I noticed was that Tails' flying is really hard to control. Therefore, although it is supposed to make him the easiest, I often end up getting stuck and trying to turn around and running out of flight. I know that even the official games are a little annoying with 3d flight (target shooting in SH, Tails' balloon mission in SA:DX) but this still makes it alot harder.
Maybe if instead of turning, you could strafe while flying, or have the SA mode movement (not flight) enabled only for flying to give more control. It seems that after descending a bit you can turn, but while rising you can't turn, making movement difficult when you are tapping it to fly. I find the only level where Tails is actually easier than Knux is Aerial Garden, but it is still hard trying to navigate.
Maybe if instead of turning, you could strafe while flying, or have the SA mode movement (not flight) enabled only for flying to give more control. It seems that after descending a bit you can turn, but while rising you can't turn, making movement difficult when you are tapping it to fly. I find the only level where Tails is actually easier than Knux is Aerial Garden, but it is still hard trying to navigate.