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As long as you're not overheating now on 2S you can add a couple teeth to the pinion and try that. That will give you better top speed. The trick now will be to slowly start ramping up your pinion size little by little until you find the sweet spot where you are getting the most speed possible...

By smaller I just meant the kits that only run the smaller 2S or 3S lipos. I wasn't referring to the physical size.

Yeah most of the smaller kits that say 2 or 3S are really more for 2S theyre just technically capable of 3S. Hows it doing now on 2S?

As I said, fans are mostly there just to cool the motors when there is no airflow going through the body. You can trying the training mode trick and see if that works otherwise just gear it down and/or switch to 2S lipo.

Well if you're running a 3S Lipo you could, it would just be harder to hook up than wiring it to the RX but if you're running 2S lipos you wont have enough power to ran the fan properly, if at all.

Do you have a 5V PC fan? If I remember correctly generally 80mm PC fans run off of 12V so unless you gonna run them straight from the 3S battery then your plan may not work

2S lipos are pretty cheap also. Id just keep the 3S and get a couple of 2S and then you can go back and forth depending on what surface you're running on? Just a thought :)

I would still add fans though if you dont already have them

PC fan in and of itself isnt going to fix the issue. Fans are nice but they put in most of their work when the kit stops moving. Id trying gearing down first, then going to 2S if you can't gear down low enough. Going 2S you may even be able to gear back up a bit afterward if motor is running cool.

I think that the 2 best ways are the two ways listed here. Otherwise you're looking at changing some part of the electronics.