I usually leave my "normal" throttle curve linear ... while the pitch range goes from -2 to 9 ... I can hover at 3/4 (maybe a little less, but above 1/2) of the throttle stick.

Regarding needle settings, I don't know ... there are just toooo many variables so you're on your own here. FYI, I have 1 turn open in my OS 91 and about 5/4 in my OS 50.

The training gear is probably playing an important factor in your setup ... chances are when you remove it, your heli will shoot up towards the sky (or at least I hope it does )

I wouldn't get a tuned pipe if I where you ... getting the main needle can already be a problem and adding a tuned pipe will just increase complexity. Besides, if you get one, you will have to tune it with the training gear on and off.

If you think power is an issue, try a higher nitro fuel.