You are on a full factory suspension setup currently?
Do the 225/45s rub anywhere at all, under any conditions/scenarios??
Those tires have a very stiff side wall, despite their decent side wall HEIGHT, so that is contributing to that harshness right there.
The sad problem is that NO ONE makes a more 'pedestrian', NOT 200 tread wear/autocross, daily driver, BOMBED OUT roads use, street type tire, with more flexible/forgiving side walls, in that size
at all.
I have 205/50-16 Nitto Neo Gens 'stretched out' on the same Dekagrams as my daily driver setup, and they are pretty damned 'cushy' over the crap roads around here, even on the so called 'crashy/bouncy' factory suspension.
Actually, they do not
appear (visually) to be stretched on the 8" wide wheels AT ALL, and even appear to have the bead 'sucked in' a bit, probably due to those tires having the very widest
section width of any of the 205s available?
You might just be a candidate for the Bilstein B6es paired with the factory springs, since you do not want to be giving up any wheel travel on those cratered, frost heaved, destroyed roads, by going to any lowering springs, despite how 'cushy' everyone on here calls theirs (their roads are most likely NOT as bombed-out as
your's are!).