Nick,
I find it interesting that you state the V-22 has never flown at 60,500 pounds. Both Boeing and Bell have on their web sites press releases that claim the V-22 has flown at 60,500 pounds.
http://www.bellhelicopter.com/en/com...lboeing_01.cfm
http://www.boeing.com/rotorcraft/mil...imes/jan01.pdf