Gens Ace 1250mah 6s on 2205 2150 Motors?

I originally ordered 2205-2150kv motors for 5s batteries, and they're super solid on 5s. However, Bos, and a couple other pilots suggested I give these motors a shot on 6s. Aside from warm motors after flight 6s was awesome! I'm not sure if i'll get 2 minutes on every track, but I was able to get 2.5minutes on this track. A fun experiment for sure and I had more control and speed on 6s compared to 5s. When does more voltage stop helping?!