RX8 truggy and buggy setups

Ok. I would buy some new batteries, going to be cheaper than new motor. I have experience with brushed and brushless cars for 5 years and I know what I do, I asked some advices from peoples who have alot of experience with brushless electrics - and now especially with that product what I mean.

If I can't reduce the power enough with hotwire PC-link, then I buy some new parts to my car.