i wound up going to 295/80R x 22.5 up front with 95# all around,  made a dramatic difference.  During the process of changing I checked the date code on the 275's and found 04.  I got suspicious and checked the rears as well, lo and behold they are 04 as well.  I'm thinking about putting up a sign in front of the dealer "Bend over all ye who shop here".  :-/