Just hovered my MT for the first time today.

I'v been hopping a couple of days when I had the chance and getting my tail servo set. Today lifted off and held it till my timmer went off(6min.) Batt. was starting to run out(ace 2200mah) headspeed was dropping, and at the end it seemed easier to hold. I'm runnin 13T on the obl29/35 with CC 35a.
Was this just me or should I drop to an 11T pinion.