Those props do seem large to me also if this is roughly on par with the FX. I've ran quite a few of the .46 FXs, and have always thought they liked to be up in the 14k range better than bogged down.

11x5
10x6
11.5 x 4

All APC have worked well for me.

There list looks like props you would reccomend for the .61 not a .46.