This is off topic, but I start out slow and slowly raise throttle. I also mostly fly off grass and keep the elevator pulled until she really starts to roll. I then gradually let off elevator slightly allowing the tail to come up. When she builds enough speed she takes off.

If I don't give any up elevator she'll nose over right away.

The OS 40 2 stokes have more hp than the 52 4 stroker. I would think you'd be fine with the 40.

Then again, I'm trying to put a 91 surpass where the max is 70 surpass in my WM PT-26 I just don't think the cubs needs any more power.

with my .52 surpass, she has great climbs, rolls, loops (tight too), inverted flight etc.

I think you'll be surprised...