Try scaling. It will also take time to learn how to use the rudder pedals, trust me.
Problem is, I too have the Thrustmaster cheap rudder pedals. They are great for taxiing especially in sims that need them like IL2 and DCS. Problem is they suck for fine gunnery. My problem is that they are "sticky" and have a high static friction to overcome, and when you overcome it you easily overshoot the desired rudder position you wanted. I've tried lubing the rails, modifying the spring, etc without totally trying to rebuild the thing on different rails or something. I think they've gotten better, but like 50% better. They still suck and have nothing to the feel of real rudder pedals.
So, try scaling, and it WILL take you a while to get used to them, so get used to dying and missing for a while.