Not sure how much you would really need to boost a 9.5 but I would not run any turbo with that setup. I run that same esc but run zero boost at most tracks. I have added a little on larger outdoor track but was minimal. As far as gearing, I would start with 21/87 and zero boost. Then add a little boost if needed, just make sure to monitor temps. The gearing listed on the AE site is a very conservative starting point.