A couple weeks ago I did a quick blast down to AR for a couple days. I had JUST put on the new Avons the night before. Scrubbed on the way down. Again, 42/42 with a fully loaded Givi E52 and tank bag. NEVER a wiggle, wobble, nothing. In fact, before I headed home, I had drug the pegs on many occasions and there aren't any chicken strips left on the rear OR front tire. I'm not bragging, I'm just informing you the there is plenty of traction at 42 psi. I ran the same pressures with the original 'stones as well, again, never a problem. Run what you feel is right for you. Have fun on your trip.
Mike