Barry,ive used 16x4 apc,and it was huge, never weighd it but i dont see how it could weigh less than the apc 15x6,but like i said i never weighed it. i have tried pro zinger x4s and to be truthful i think your just spinning your engine for nothing, i like the grab a 6 has and just use my throttle to adjust control, but i still have the graab if i want, i know im going against the grain but did i say i like traction?i have ordered a new pro zinger 15x6, the one i broke was a reg 15x6, the pros are more in between a reg and a W.

now as far as the weight goes for it, it stands right now at 6lbs 2oz. i do need to go to a 2.25 in spinner and dump this 2.5 in tru turn

v twin 1k,these props these guys recommend will help some but i dont think there gonna give you what you want, you will have to break down and purchase a larger engine, id say at least a 72 four stroke to get a decent pull out


ron, glad to hear your having some good luck and a good time
good luck!