Mine has a YS63 (4 stroke) and does virtually every vertical manuever imaginable with a 13x6 APC.

The Magnum 52 "XLS" is a 2 stroke. You aren't referring the the Magnum 52 RFS 4 stroke are you? I have both. The 4 stroke 52 is a very good engine but will not be enough power for this plane.

The 52 XLS (2 stroke), when broken in and running 15% 80/20 mix has similar power to the OS 50. Dumb question, but what prop are you using? If hovering and vertical manuevers are your main quest, you will want a larger diameter prop with lower pitch. Along the lines of a 12x4 or 13x4 possibly. You should be getting over 13,500 rpm on the 12x4.