just a little quiz - which 18" street tires have softest side walls?

as i will redo my suspension with very stiff springs/shocks i will need to put on street rims set something extraordinary soft to compensate ride stiffness as car will see some street driving from time to time and I do want to prevent my passengers from having extra dentists visits.

i am going so far to put back winter PA2 set on stock 18" rims but do wonder - is there anything with even softer and taller side walls than PA2 winter tires?
i do not care much of performance here as for myself i can always put on one of racing set with r-comps, just need softest possible tire.

 

I hear you... I appreciated the softer PS2 over the Michelin Cups on our poor streets.