RE: U-can-do 40 with .46 FX doing the job?
I am sure you could pull out of a hover (Albeit slowly) with an OS-50SX and Tower muffler ($15-) or better--- Just keep it light... I had a heavy profile (Topcap) that was a rocket with the 50SX ...
You are not going to get crazy 3D performance like with a Saito-82 or91 but that UCD is pretty light- I have seen one hover with an OS-46AX but it was wide open barely hovering---
If you run a Zinger wood the 50SX is happy swinging a 13x4, which would help your cause-