Lelit Elizabeth OPV questions

Hey everyone. Was wondering about lowering my OPV on my Elizabeth. Like other people who got it new, the pressure gauge shoots up to 11 and even 12ish sometimes when first starting a shot then backs down to 10ish.

I’ve noticed I’ve had to grind pretty fine on my DF64 (5-8 with chirp just past 0). Shots come out fine and can dial in well, but wondering if lowering my OPV would allow me to grind a bit coarser. It’s mostly when I’m doing true light roasts I’m having to grind super fine (4ish on DF64) and I feel like it’s causing some fines and channeling even with good WDT. I’m feeling like they overshoot the pressure for dark roast Italian style maybe? Wondering what everyone’s experiences have been. Thanks.