Didn't read the whole thread. I will admit that out of the gates. So if it's been covered forgive me.
205/45/16 has the functionally the same outer diameter as 195/55/15. Switching the two will not make a noticable difference between ride height.
Offset. Stock meshies are +42 I think. Here's my db7 with the natural camber a half inch higher than the pic below.
ignore the slamboard.
This is the dc2 with the same height as the silver DB below and -2*f/-1.5*r camber.
at +40. I did roll the rear fenders which pushed it out a little. And pulled on the fronts just a little for insurance.
Comfort/stiffness comes from everything that sits between you and the road. Bushings, shocks/springs, and tires.
Bushings are self explanatory. The stiffer they are, the more energy they transfer to the chassis. = rougher
Shocks/springs. Koni/gc is a fabulous set up. I went with non-ots rates: 440f/350r. For this amount of low. Had the setup on a db7 and a dc2. Both pictured.
The adjustability of the shock is a nice touch. Allowing you to dial in exactly what you want. I rode just a touch back from full stiff. I paired that with extended top hats and hard race bushings in the top hats, RTAs, upper control arms. And had function 7 LCAs with respective bushings.
I liked it a lot. Never bottomed the shock out. But the UCA in hit the towers a few times.
Tire comfort is directly dependent on tire pressure and initial/resulting sidewall stiffness combination. I ran Bfg sport comp-2s in 195/55/15.
With all of that it was very very comfortable I got a really good feel for the road but didn't feel every grain of sand I drove over. Ultimately feel comes down to what you like. I had people tell me it was way too stiff (compared to their Buick regal) or not stiff enough (hella-slammed static Miata).