Hi, we recently started allowing brushless 13.5 at our club too. Have you gone up a few teeth on your pinion? I found I had to go up about 5 teeth! Just keep an eye on your temperature. If you gear too high the motor will get hot.
I run a Novak esc with a Losi motor, as long as you run a sensored motor you should be fine.
It may be worth checking the setup on the esc and possibly reset to factory.
Have you checked the end point adjustment on your transmitter? If that's less than 100%, that won't help.
Good luck
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