There are a few things that you can do, I am not familiar at all with the type of buggy you have but can give you some general answers. First, changing the toe in or out on the front wheels can help a lot with you pushing problem, you should have some toe in (5 degrees) or you can try more and see if that helps you problem but can effect straight line steering. Second, if your rear end seems to push alot in the corners you can adjust the toe out to make corrections, if your car is adjustable it should have come with toe blocks to change the rear toe. Third, try adjusting the camber, either positve or negative on the front and rear wheels. Read your instruction manual and youll understand a lot more of what Im telling you. The diff fluid will have handling effects also but not as much as what Ive told you already, I cant give you specifics on the diff fluid to use for that car, check your manual. A good start might be 5000 front, 7000 center, 1000 rear. Make small adjustments to the stocks settings and run the car to see how the changes took effect and youll learn how to make the car handle better. Good luck.