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What you might try is adding a steering stabilizer shock system and just remember if your tire drops off the pavement back off on the throttle don't brake, get control (your first reaction is going to be to jerk it back on the road) just get control and continue going straight and gently easy it back on the road. Many peoples first reaction is to panic and jerk it back onto road and hit the brakes this causes many problems. Braking adds more weight shifted to front tires which make it harder to control tire in the dirt. One other key thing to do is don't stare 2 to 3 cars in front of you, you need to look as far ahead as possible, what this does is keep you centered in the lane, its when you only look ahead just a few cares or even a few hundred feet you will find you will drive to one side or the other. Find some real good wide road and drive it a lot to get used to it, don't give up, you will gain your confidence. One more thing I would do is add some really good shocks to it to reduce any rocking or swaying. There are some very good systems to improve the steering it just takes some research.