Emory,

Dan and myself are using the 20x13 APC e prop with out any problems.. (5330/FAI) you could also save some weight going to a HV45 and just have some good cooling to it.. Try to talk to Bernie at CC here is his Ex: 123

I also have some other props if you want to do some testing.

Scott Anderson
Team Castle Creations
Team Tanicpacks.com

PS: I'm going to hook up with Mike H. on Wednesday and get a good look at the BM..