If you want to go brushless build it to go brushless speeds.The slayers I build go up to 120mph.
Add one carbon rod under each side of the wings Appx 2 inches back from the leading edges and extend to wing tip.
Wha la! U have the ultimate wing. It is called The zagi spanker.
Here is apic of a 5 spar 60 in raider,a 3 spar slayer and a 3spar zipper Ther is no packing or strapping tape used.The all do 100+ mph W no hint of flap.
