Okay, I have a new challenge for you:
spend 1 hour on one nose. Try to slow down and thing more about what you're doing.
Then do two noses in one hour, but try to get the same quality as the 1 one. Then keep adding more until you can do a few in an hour with the same quality. I'll try to help you with shading this weekend.
You have a lot of drive and stamina, but I think your current level of patience is holding you back.