The unmilled/solid motor plate will fix that, the milled ones are rather soft, and when heated up bend rather easy. One of the first things I do out of kit is replace the motor plate. I've noticed nominal heat difference, and the price for the solid plate is like half the milled.

I find on a club level where you are racing with varied level of drivers or even other classes in practice, the bumps and knocks the car can take much like the SCT you had hit you bend the milled plate really easy. The pros dont have this problem because seldom do the crash hard or have someone poleaxe them.

An easy way to see if your motor plate is bent is to look at your gear cover, if its not sitting flush on the motor plate, more than likey your plate is bent. Over time (esp if you do a diff rebuild) this can make the spur and pinion mesh funny and can also wear the gears in the diff different to normal and the transmition can become noisy.