Same thing with Isuzu, I installed the body lift so I could lower the suspension becuase it got really stiff at 4" IFS lift.
The BJ flip won't cause lift because you flip the top BJ and the lift comes from the lower A-arm. Addtionally, you don't need the low profile bump stops since the BJ flip mounts the spindle a 1/4" (?) lower. Low profile bump stops will give you another 1/4-1/2" down travel.