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Tires with higher load rating would most likely have more RR at a given pressure, but they also accept higher pressure. I say that because I imagine that the stiffer sidewalls cause more RR when they deflect. I think the total deflection amount would be pretty much the same but the force required to cause it would be more.
If you can put Load Range E tires on, you're looking at a rated maximum of 80psi. If your car isn't heavy enough you won't be able to use that (handling would become bouncy and skittery) and you would probably be better off with 50psi P-metric tires. If it's a fat pig (much heavier than frankencav) then 80psi could work.
FWIW, 80psi is marginal on the rears on my truck when it's empty and the road is slippery. It's always good at the front. I weighed it at a truck scale once that tells you axle weight; there was some stuff in the bed, but it should be good for reference. I'll have to try to find the scale printouts.
51psi is great front and rear on my 3000 pound VW. I imagine 60psi would be ok too but I choose not to exceed the tires' ratings.
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goofy1 
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