If it staying only with one setting is not fully paired. Had this issue a few times, but linked it to pairing.
It took me a few time to get them to fully sync and run right. The Mp60 seemed the hardest to get paired.
First delete them all from the ghl vortech controller, then do a full reset on each of the Vortech powerheads.
Once you have them all reset, power down all the vortech powerheads and power up the first one you want to pair and go ahead and pair it. Once that one pairs power up the second one and begin to pair that one, leave the first one on. Keep doing this which each one when your done save your settings on the P4.
For some reason if they are all powered up when you pair the vortech powerheads they get confused.
Once I had them fully paired they saw all the programs without any issues unless I turned them below 15% power.