i installed the 1/2" on both sides. i was worried i wouldn't have enough clearance for the big tire with only the 1/4" spacer on the passenger side, otherwise you're right, i would have done the 1/2" on the driver side and the 1/4" on the passenger side to level the truck out.
Are you running stock coils or OME 885's with those top plate spacers? Reason I ask is because I have 5100 and 885 and been thinking about 1/4" and 1/2" on drivers side spacer to give a little more lift because I'm not at a full 3".