Mine worked better with 3 blades as well.....also worked with 4 blades, but 3 blades were were best.......30" Labbed 3 Merc Cleavers were best all around...just liked to throw blades...
do you recall how low your motors were mounted? Mine were slammed at the bottom. We raised them one position up, and removed the whaletails, installed dans three blade 32's....at 97-98mph started bucking like a rodeo horse. Would have like to played more with set-up. maybe Chip will continue to. MAYBE those props didnt work cause they were off a Spectre????