I have the Magic with a TT 46 pro spinning an 11x4 prop.This combo is great for me,but there are a couple of tricks to get the performance you'll need from this motor.

1.- Pull the baffle out of the muffler.It restricts airflow too much.

2.- While you have the muffler apart.Drill out the exit tube to the largest diameter you can without making the side wall too thin(I used a 5/16 bit).

These little tricks will increase throttle response and give you more power.I like the 11x4 better than the 12.25x3.75 because it spools up quicker.But it will hover a little better with the 12.25 because of the larger diameter.
I didn't like the L-bend design in the control rods,so I put solder clips on instead.Oh yeah,the landing gear sucks.Mine broke the first time out.A poor design.Changed to aluminum.Hope this helps.I like this plane with this motor.

Hank