I'm all for the flare delete as both my fenders are creased from the OEM plastic flares rubbing against rocks or trees and were quickly deleted (not quick enough I guess).
I'm just not sure about the design on these. I'll have to see them installed to get a better idea. Ideally a flare delete...
Tire pressure is vehicle weight and tire size dependent. There is no such thing as a one size fits all psi. Use a chart if you don’t understand how to find correct psi for YOUR weight and YOUR tire size.