I'm having clearance issues with my QAD ultra rest too. It's not much, but there is contact with the rest. It was explained to me that, the rest bounces back up after falling. My rest does not touch the shelf after falling. It bounces back because the spring is too light. A guy I trust at my local pro shop showed me a slow motion video of this happening. We tried everything he could think of and still couldn't get 100% clearance. Not sure if this helps. Don't beat me up if this information isn't correct. It is the opinion of the pro shop employee. Anyone else heard of this with the ultra rest?