Normally it's a concern, but the +2" kits don't require taller bump stops.
It looks like the +2 shocks have a compressed length of 15.55" for the front and 15.35" for the rear. Stock shocks I found to be about 12.87" and 13.62 I think, respectively. Seems like a pretty big difference to me, but you're saying that the stock frame bump stops will contact before the shock compresses fully?
Just curious since I've been thinking of running longer shocks with stock height springs. However, not sure if it will be much benefit since the springs will need to be retained from dislocating?