Tire Pressure

Have a 2003 CLK 500, Mercedes reccommends 30 front & 33 rear but if going over 100mph 35 front & 38 rear. Would I be okay tire wearing wise just to
keep the pressure at the over 100 mph settings even though the fastest I go is 80mph. Also read on the forums that the pressure for the fronts even the 100mph one is too low for the weight of the engine & by 10,000 miles the edges are worn form underinflation. What pressures are everyone using on their CLK 500's.
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