The Magnum 1.2 FS will probably be a little underpowered for a 120 size aerobatic flyer.
Good Flying,
Mike
Goldburg Sukoi 26 mx ( 120 size) w/ Saito 1.80
GP AT-6 (40 size) Saito 65
Goldburg Tiger 60 (60 size) OS .91
CMP 27% Extra Moiki 2.10
You can probably see a trend here