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Tijmen-
Could you elaborate
As a starting point for experimentation, I use tyre pressure/bar = 1.3 × vehicle mass/kg ÷ tyre width/mm
For the above case of a 55kg rider and assuming a light unloaded 7kg bike and 28C GP4000s blowing up to 32mm on the wider rims,
1.3×62/32=2.5You then adjust for front/rear balance and for tyre construction and personal preference for ride and handling and maybe for compromise between comfort and efficiency in some circumstances. As I said, it's just a way of picking a starting point, and it's only for bicycles with tyres of essentially circular cross section and very high casing compliance.
gbj_tester
How far under? I'm guessing 28C GP5000s on 22m rims are going to be about 32mm actual width. My bag of a fag packet calculator points to 2.5bar (35psi) for a 55kg rider as a starting point, +10% at the back and -10% at the front is not a bad place to start for balance, so 38R/32F.
I think GP5000s can be tad harsh because the casing is coarse, but it's not like there's any much better options in 28-584.
Making the wheels less stiff won't help.