Glad to help. I'm just passing on info I've learned from others (such as Speedy!).
Manual calibration seems to help these a lot (the Hubsan line of quads uses the same flight controller that this and the ProtoX uses, they even use the proprietary Hubsan radio protocols) so I recommend following Speedy's advice and running calibration on a measured level surface.
Like many of you I initially had a lot of trouble achieving a hover as my tiny quad needed tons of trim and calibration. When I first powered it on it zipped right across the room in less than 2seconds. It took me about five or six full battery flight times to get it trimmed to the point that it would stop flying wildly across the room with no navigational stick input. I still have to adjust trim regularly, but that is mostly because on my Hubsan I have multiple nonidentical batteries which have different weight distributions. Your ProtoX lookalikes shouldn't have to worry about that but you will still need to do adjustments because the arms are not rigid and tiny nicks in the props will change the thrust profile.
The best advice I can give is remember that the air bouncing off the ground has a profound effect on these tiny quads and in order to break free of that and see how it is actually handling you need to get about three feet off the ground. You'll want a fairly large room to work in initially, 20x20 would be ideal for short (<10sec) flights while trying to trim it out. If you can get to a barren parking lot you'll be able to trim it out very quickly and safely. From that point on you can get it stable enough to fly well in small rooms.
By the way, I have the latest generation of Hubsan transmitter, and if these knockoffs are using the same boards inside the start up procedure matters greatly. If you turn on the quad before the transmitter is turned on it resets the calibration and trim on the transmitter to default, every time. So turn on the transmitter first, then turn on the quad. To shut down turn off the quad and then the transmitter. Calibration procedure is still the same as before; turn on transmitter, turn on quad, place quad on level surface, press left stick to the bottom right all the way, move the right stick back and forth between full left and full right fairly quickly until the lights blink.