pls90,
I think this might work.
The system also has a “concurrent’ mod that allows more than one station to be on at the same time, Options>Station handling>uncheck sequential.
Instead of declaring one station as Master just schedule the one you use as master to turn 2-3 minutes before any other to give time for pressure to build. Then schedule one other station for the desired time. When the second station is done, keep the “master” running for a while and start the next one…
Dan