Try a drop feed test with fresh batteries in the rotor and see how it's going. Rotors are constant feed, it shouldn't be having trouble feeding after different shots.
What paint are you using? Is it in good shape? Rotors can be very paint picky. Poor quality, old, or even fresh paint that has been exposed to hot/cold or moisture may not work right.
220 FPS is a really low chrono, some markers will struggle to cycle at the pressure. My guess would be maybe your bolt isn't returning all the way to let a ball in the breech?
Try the drop feed test on the rotor, the try firing the mini on ramping at about 290 FPS chrono and see if that makes a difference.