[S6F]

Even with regular P7 tires, under inflated, I find the suspension unable to soften some of these local NJ roads. Thinking of moving from 19” to 18” with the taller side-walls. Or, possibly keeping the 19s and getting 245/45 to replace the 245/40 tires for a similar profile. Do you think that would make a significant difference? Thanks for your help.
‘19 540ixMSport