This van is specked for 35 PSI and the tires I have on them max at 44 psi per/sidewall. Is it ok that I keep the cold pressure at 39 psi? When I've been keeping them at 35, I always encounter cooler days where the cold psi dips to 32 or 33 when the van specifies 35. So I've been keeping them at 39. It seems that on hot days, it won't go above 44 and cooler days it won't dip below 35 psi. Is this a good practive and no harm being done?