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Well, you're right that different tires require different pressures, although this effect is probably small if you stay at the same size (definitely not 32 vs 45 psi). Similarly, a tire manufacturer can give a recommended pressure for a given weight, but weight is not the only factor. The factory values considered wear rates, noise, ride comfort, and performance. Several of these factors depend on the suspension setup of the car (not just weight).
It also sounds like JStriker just has one recommended number, not a table, so that would be even less accurate.
Anyway, the front-rear split is important, and you should keep it the way the door jamb says unless you specifically want to change the understeer or oversteer characteristics. Its kind of fun to play around with pressures. See what you like. It will be obvious when driving the car if the tires are over or under inflated.
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