Have you considered just using the extended drive cups? I put a set on my Flux and am happy so far - but I've only got about 5 packs through it with them.
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES