We built this 450 size quad running OpenPilot with Sunnysky 2216KV1100 motors. It has tons of jello with Gemfan 8045 carbon props.
We switch to some cheap no brand 8045 props, and it flies very smoothly. The Gemfan props likely are either un-balanced or too heavy compared to those cheap props.
We absolutely love cheap stuff that works, for the better.