Funny. How come u say the car is so bad now! Just like the time when u want to sell your Slash 4x4...
I don't think the car is as bad as you said, just you cant control the car well. My friend also own this car almost a year, the car condition is still very good and the track conditions we played was much much worse than MX Club...
I would suggest you to learn how control the car more carefully first, otherwise you will keep damage all other cars, no matter you changed to play other shortcourse or 1/8 buggy.