Losi mini late-model/slider gear size?

[E-Revonut]

I race a losi mini late-model at my lhs's carpet track. It's a stock class, but I have managed to sneak in a Mamba25/5400kv setup. I'm still the slow one in the expert class, got moved up from advance. My problem is finding the right pinion gear for the motor. The pinions that come with the car are 14,15,16 but are plastic and just pess on, the stock motor has a knurled shaft. Well after blowing 3 stock motors and removing the 16t pinion several times it will not hold on my cc motor. My question is what pitch are these gears? They are the same between the mini-t, slider, late-model, m-lst I beleive so if anyone has one of these and can enlighten me it would be appreciated, otherwise I have to try CA or loctite to hold the 16t on. The 15t is leaving me a few laps behind!