Add timing to the V6. By looking at the specs, the V6 should be a lot faster. The other motor is a Keyence motor, and I can't find anything stating the timing on it.

Keyence Motor:
Keyence Luxon KG Series Brushless Motors - Your Home for RC Drifting (driftmission.com)

Surpass Motor:
Surpass Hobby | Rocket-RC V6M Modified 7.5T Sensored Brushless Motor SP-054006-12-7.5 (surpasshobbyusa.net)