By putting 22" front tires on the bike you've changed the COG, and put the nose of the machine farther into the air. A 1/2" might not seem like much, but when you're teetering on the edge of balance on a hill climb it can be a lot. Also, it's quite possible the new rear tires grip better than the stock ones did, and that same amount of throttle now sends the nose skyward instead of inducing more wheel spin as the stockers did.
Making alterations to the suspension, specifically lowering front preload to drop ride height and stiffening the rear shock's compression and/or preload should help some.
Photobucket is trash now, use something else.