If you're looking to save as many skill points as possible but want full cooling efficiency, reference this. There's 10 heat skills, and the rest are junk skills. Here's the best way to those 10 heat skills.
note: You don't need to have speed retention at the top row, can choose improved gyros. Either or, it doesn't matter.

I tried to make it simple. Yellow circles are what you want, red lines are the path taken.
I personally feel this tree should not have hill climb/speed retention/gyros, as it seems like they kind of threw those in with the rest on this tree. But basically what I found with the skill tree is, invest into mech operations like this, get a decent amount of agility to your liking (near full tree most of the time) and the rest is the extra points you get to throw around.





















