I am running a 17.5 with a 82/26 ratio . It has a FDR of 7.4
based on Novak recommendations. I am going to try a 27 and 28 and check temps. Heck after running 4 battery packs one after another in a row
the motor has gotten hot but Esc didn't . I run sportsman class(novice).
I like the motor its giving good torque on a small technical track. But what it has taught me is to be a better driver (slow is fast is every one kept telling me at the track). The motor doesn't seem slow to me but I am a beginner.
I can understand some folks complaints but if you been running 27 t more than 2 years you should have really bumped up by now to a speeder class.
My son runs brushed, I like both brushless and brushed. Brushed has taught me how to clean a com, to replace brushes gave me a little better understanding of motor maintenance.