I find that I ride early am for 200+ miles on stock re-worked seat(lowered 1 inch and firmed up with memory foam) on R3T and then another 200 with my butt-buffer gel seat pad followed by the last 100 with stock..changing seat helps circulation,my arse and sense of feelings.I also do only 500 miles or 10 hours..whichever comes first and have found myself neither too tired or exhausted on long trips..Drove professionally 18 wheelers for 43 years and find this doable!Living here in Kent,Wa. I would start in Blaine..Definetly an advantage being 2 hours from a corner..leaving 20+days for 3 corners..time to enjoy the trip with lots of stops so may need to make that a 11 or 12 hour ride day!!I also prefer to ride small group(no more than 3)..when riding in a pack<People seem to inherit pack mentality and competiveness!!
