Upgraded all drive train bearings and now it nosedives on brake!!
I never had a rc car do this it literally wants to flip forward, I reduced braking power.. However in this case will heavier rate springs and oil help this phenomena. I think my rc car just crossed over to this place called high performance. It also does some gnarly pop wheelies if there is enough traction.. my poor wing is getting shredded up top and bottom.

I think increasing arm kick up might help.