hmm. this trip you took... was the back of the seat occupied? i do many miles routinely and insane miles periodically, and the flat 550 seat is now part of my secret, such that i question the "bucket" approach entirely, however soft. once i picked up a luggage rack for my gear (thus freeing the pillion area), between the stock pegs and passenger pegs, the ability to scootch around and use slightly different positions dramatically extended my "rider service interval". and a short stint of peg-standing goes a long way, too. release your inner squid. (relatedly, it took me about 40 minutes on a ninja for the first time to figure out that "stunting" probably had its genesis in necessity! "officer, i was not showing off. i was giving my poor ass, knees, neck and wrists a much needed break.")
that all being said, my current seat cover is splitting, so if you do ditch yours and it's intact, give a holla, dawg....
-jon