I recently changed from 30-42-52 chainrings to a 28-38-48 chainrings. I swapped out the cranks and adjusted the Derailleur just fine, but I didn't drop the derailleur down, since I would have to re-align and re-clamp the seatpost clamp. What kind of problems can arise from having the derailleur be higher than the 1-2 mm height suggested? In working through the gears there doesn't seem to be any problem shifting. At this point, would you drop it down or leave it be?