AFAIK, already at the top of the range. Evenness of precipitation
across the installation may also be a factor. Plus it makes sense
to add in the extra zones, now that there's more water than the
designer thought would be available.
If you have way more supply from the well than you planned for, then you can plumb in a
"Cycle-Stop Valve" into the well setup. The simplest of these will cap the outlet pressure at 60 psi maximum and allows the pump to run steady without cycling.