You sound like you know what your doing, I mean you race.

Servos.? What are you using.?

Mine normally lifts a rear wheel up while turning, tarmac or dirt...

Brakes, I followed what another user ( sn00p ) posted, and they're fine now. Picked up a set of Racers Edge Super High Temp ones for a greater bite.

It sounds like something is stopping your Hyper from turning at full angle.

***edit***

Heres what mine looks like at full lock, I had to dial down my EPA's to around 60% so that the wheels dont rub the lower arms.

It turns like a cartoon.!