We ran GP’s and never had a front end push. If anything, we were famous for blistering our fronts on the GP. All chassis will have different things happening, it’s just up to driver style, tire type and condition, and track conditions. The GP6 is not as tunable as the GP8, but they are a very well built chassis for the money, and there are many spares and support in this region.
The YZ is a good motor, but not legal with SKUSA or CSC. Good club or rec motor with very good top end.
Good luck out there, and have fun.