I've drifted and rally raced a TL01 with the Novak SS5800+ brushless setup. I can tell you a lot of guys in Hawaii had the same setup without issue. If you get the 10.5 & run the 19T pinion, that's actually about max for the car. If you go to a 21T pinion and race it, it will go into thermal shutdown after a few minutes. Make sure you at least have bearings in your TL01 and don't use the speed tuned gear set because that will make your gear ratio too high resulting in thermal shutdown.
As for the parts you are looking to buy from RCMart, I'm going to tell you to save your money. I bought that heatsink motor mount and it didn't do much at all, plus you have to flush cut a piece off of your chassis as well as glue in the plastic gear cover. A slim clip-on motor heatsink will do a much better job. The aluminum gear will slow your car down due to added rotating weight and also wear down you other gears much faster, so I really wouldn't recommend this either.