I recently made 2 changes, replaced 1.5HP pump with 2 speed Hayward and I also replaced my 5 pool jets with the slotted type instead of eye ball.
My PSI at high speed is about 15 and at low it is 3.
When the pump was first installed this season, it was able to turn on the heater and now it can't but I didn't record the original PSI.
The other problem that I haven't been able to solve and I don't know if they are related is that I can hear one of my jets in my pool stairs making noise, like maybe air is trapped and it doesn't change if I adjust the slotted jet.
No amount of back washing, rinsing, ricurculating is making a difference.
I'm also ready for a service call on both issues, hopefully I can get some advice here to fix it.