Please don't make me feel dumb about this, as I feel dumb enough already, but I looked at the manual for my 758 and saw that the HDAP rear tire pressure was listed as 6-10 PSI. The dealer delivered it at 20 and I aired it down to 15 for more comfort. This was the same on my original one too. For some odd reason I never looked in the specifications section of the manual before.
Well I just aired the rears down to 7 PSI and man, what a difference! It's soooo much more comfortable now. It's like a boat! Now I feel stupid for not looking there earlier.
What tire pressure do you guys run in your X700s?