Trouble with 1spins down/up curbs

I have pretty much perfected my 180 unispins rolling, sometimes I have to hop out of them but can usually roll out. I’ve been trying to do them down curbs but I can’t. The pedals always turn in mid air and when I land they are vertical. The few times the pedals don’t turn I can never seem to see feet, if that makes sense. Any help would be awesome :slight_smile: