The bouncing at low pressure really makes the MonoDrive a pain for GSHP.
I think that I am going to have the well guy come back and reduce the pressure, while measuring the pressure at the entrance to the return well. At the entrance to the return well the pressure only needs to be minimal (correct me if I'm wrong here). All pressure at the return well is litterally energy/money down the drain (correct me if I'm wrong).
My guess is that the pressure will have to be dropped to the minimum of 25 PSI that the MonoDrive will handle. Then it is likely to bounce all over the place. Then I need him to show me the variable speed working at the 25 PSI between 7 and 15 GPM (my heat pump requirements).
If it is unable to handle that I'll have to discuss with him what he can do.