I have a Hayward S200 sand filter and a 1.5hp (I think) pump that operates clean at 26psi and I let it get up above 30psi before I backwash. Is that operating pressure too high?

I have an inground pool, 20,000 gallons with two returns and two intakes. One intake is at the skimmer basket and the other intake looks like it may have been for a suction side cleaner. I typically keep this one plugged because I don't have suction side cleaner and it is installed rather close to the surface so when the water level drops it seems like I would get air in this intake.

Is my thinking OK here?