The guys who ran my MSF class were laid back and just helped people with issues rather than dismissing them. I had problems with stalls on the first 2 ride days (class was 5 evenings). The stalling is an issue with giving the bike a little more gas but also in letting out the clutch slowly without dropping it. I have small hands and the friction zone was away from the grip so I was still in the friction zone when my hand was fully open. Initially I was dropping the clutch at that point rather than just continuing to slowly release and changing my hand position if needed. The balance issue will be the same thing. You just need to practice the basics over and over to get them drilled in.
Did you drop the bike a lot before they dismissed you? Just stalling the bike wouldn’t have gotten you dismissed.