First off, yes, it is safe to put a pair of lowering springs on the back only. This will help to "level" the car, but keep in mind that almost all lowering springs on the market are of a higher spring rate than stock, meaning the stock shocks will not be up to the task of controlling them and you really should upgrade rear shocks at the same time. The good news is you do not need a spring compressor to change all these parts on the rear, so anyone with a couple of wrenches can do it. Tricky part is finding JUST the rear springs!!
What I'm really struggling to understand here is how you could replace one set of tires, all four of which were the same size, with another set of tires all of matching size (though different from the originals) and only impact the ride height on the rear. That's sort of like saying "my car was sitting on 2" blocks at all four corners and I changed them all to 4" blocks. now the car sits 2" higher in the back but no different up front" Just doesn't make sense.
As for the improvements you've seen with these new tires (ride harshness, road noise, etc) all I can say is - handling comparable to the RSA's ain't sayin' much!!! Those tires are terrible!!!
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