There isn't a lot you can do in these situations. We have the same sort of conditions at our track. It's part of REAL racing, not like those carpet munchers (i'm gonna get slammed for that one).
You can change your setup a bit to get more body roll, that will help with traction. You could also go down a grade in tyre, but that will wear faster which is what you are not looking for.
In the end, it will help with throttle control at least