2021 Toyota Tundra with Method Mr305

Rough Country 2.5-3" Leveling Kit
Method 305NV Matte Black 18x9 +25mm Wheels
Falken Wildpeak AT3 305/65r18 F

I hadn't realized the Falken were F rated with a max PSI of 80. I'm not 100% what pressure to run them at for daily driving. The install shop has them at 33/35 psi (front/rear), which seems like it's too low for these kind of tires. Any suggestions there? Is this "12 ply" and is that going to cause me issues? The shop had initially messed up balancing the tires, but after taking it back in they seem to have gotten it right as the ride quality has been excellent so far. I really liked the stock 20" wheels/tires that she came with, but (mpg's aside), the overall smoothness of driving through backcountry roads and highway driving has been improved with a smoother ride. Also - really surprised at how quite these tires are given their aggressive tread and heft. I'd say that, for the most part, I've not noticed an appreciable difference between the stock tires/wheels and these as far as noise is concerned. Will be interested to see how they wear.
There's a little rubbing on the front fender liner when wheel fully rotated (especially in reverse). I'm thinking of adding fender flares, though I'm not finding any that I like enough to pull the trigger and having a hard time visualizing them on my truck.