I started using the overdrive pulley and noticed this behavior, so I adjusted my driving just a tiny bit.

Brake hard for corner entry, before turning in too much
Feather the throttle early to mid corner
Hammer down out of the corner!

If your ESC has a push control, you can use that to help a little bit.
Something I'm going to try during practice for the Novarossi Challenge this weekend is to set my throttle trim so that neutral is actually giving me about 15-20% throttle. I can still stop the truck with the brakes and hold it there, and when I let off the throttle for a corner, it will help pull the truck through without spinning the back end around.

Not saying these are the best answers, but it's something easy enough to try! No new equipment necessary.