I honestly don't think I have any advice for you...I use Tamiya airbrush pots as well straight onto the white body.
I get 2 issues:
1. As you've stated I get some rub and cracking marks in the paint.
2. I sometimes also get a weird spider cracking in the paint under the clear coat which I believe has to do with the flexing of the body on and off of the chassis mounts.
All in all I mostly ignore the tiny dramas. I' used to be afraid of running the bodies but now I see it as the effects of racing that also occurs on 1:1 liveries as well....ever see what an Audi R8GT3 looks like at the end of a real life sprint race?
One other thing I've trended towards is doing mostly white race cars as it's less noticeable when impact chips occur on white bodies.
I guess long story short (too late!) is learn to live with it if you want custom bodies.
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