Glad to hear your forage fish are doing well!
Sorry to hear about your HSB mortalities. If you have observed 21 morts, your actual number is almost certainly a little higher than that.
I would sure like to know the possible causes of the observed deaths before trying again. Poor transport conditions, failure to acclimate to pond temperature correctly, etc.
We have lots of experts on the forum for fish handling and transport. Perhaps start a new thread and list as much information about the stocking process and conditions in your pond as possible?