Sounds like pretty normal behavior. Usually if you are light on the gas while turning, that will help. Also, avoid getting on and off the gas in turns. Why? On the gas, the outside wheel unlocks in a turn and the inside wheel drives. Off the gas and the inside wheel unlocks and the outside wheel locks up. It is those transitions between inside and outside wheel that causes the bucking, since the wheels are rotating at different speeds. So if you can coast into a turn then apply the gas smoothly one time as you come out of the turn, that will help to minimize the bucking.