Hey Michael, search for Nick Adams' channel, he has a video called blinky brushless motor sweet spot how to set. He goes over how to do it there. Nick unfortunately passed away a few years ago, but his videos and knowledge are still available.

Hi, 7000mAh is a pretty good capacity: I think you may be able to get two 5 minute runs if careful but given it’s a short track with lots of acceleration and deceleration you should be careful with gearing, higher number FDR like 3.8 to 4.0 perhaps? Also don’t have the motor timing set too high, that way you can get the most out of the battery. If you are doing two runs be careful the voltage on the LiPo doesn’t fall below 3.2volt per cell so total 6.4 volts. To be on the safe side if your ESC has a voltage cut off set it to 7.0 or minimum 6.8 volts. If your ESC doesn’t have this feature then bring the car in halfway through second run and check the voltage, if it’s ok carry on then check voltage at the end of the run so you can be sure it’s in the safe zone. Cheers

So basicly you gear up to certain temperature more than trying to find right ratio for every track. I run fwd car with 17.5 outlaw motor and i've been wondering if i should lower the fdr for less torque/wheelspin or going even higher fdr for smoother throttle input?

Yes slot machine is the replacement effectively. Mine had bad phase alignment so just got another sensor board. Hobbywing G4 excellent also and they always have good build quality

I go to 7.4 volt, 3C is 3 times the capacity, so if you have a 6000mAh battery 3C would be 18 amps