Check out "rctoy.com for FMS Dragonfly models.

http://www.rctoys.com/rc-toys-and-pa...IM/RC-PARTS-DR

Yes, throttling up too slowly can cause problems. Practice throttling up in quick yet smooth manor and see what happens. Another thing is that most helicopters tend to drift to the left during take off. Adding a little right aileron roll during take off can correct this and you will, in time, do this without even thinking about it.