Zig - I've never wheelied my 900 ever! About two inches of airtime over the mountain at Cadwell is the only time the front gets light with me on board.
Seems mine is a bit of an unusual failure so, I might persue it a bit more in case its something DUK might want to know about.
Crack near the steerer stop could just be paint cracking (hopefully) - Might be an idea to repack the lower bearing after any repair is done if you go down that route - might be an idea to ask you repairer?
I remember seeing it can be done with the bike intact and simply earthing the frame (Skidlids post? DD frame repair)
Good luck all - Frank