As for the O-rings, I only used one per side, and I keep the others as spares. No LUB to be used, just keep them dry and clean. The suspension is very scale with one O-ring per side. I like to have the LG take full deflection at 2 x AUW, or one side takes full deflection at AUW. Works great.

I did break an O-ring when I stretched it. So I don't do that anymore.

GG, what do you measure for watts at full static throttle? What are your flight times and battery mah? I like the idea of swinging a bigger prop!

PS GG is spot on with the Esc and BEC. And I heard of some issues with the Castle BEC setup with a Spektrum system. Not sure of the issues, but might be worth some research if you are using a Castle.