Same here, adjusting priority does not work for either pin groups or shutting down problem.
Due to exactly the same issues you mentioned, Impero finally contacted me last week after umpteen requests.
A member of support took over, tried something that another member had already tried the week before and of course it didn't work.
The call was then escalated to a more senior member of support, first thing he did was to try exactly the same thing again??.
After 2 hours and various unsuccessful attempts to fix the problem(s) I was told that he had another call and he would phone back the next day to continue where he left off....
......I'M STILL WAITING!
Came in this morning to another problem, all consoles that were on 5.3.25 could not contact the Impero server. Uninstalled, reverted consoles PC's back to 5.2.10 and they can now contact server again.