I am trying to zero at 20 yards and have run out of vertical adjustment. I am 2 1/2 inches high and can't lower the scope any more. I called tech support and they told me to lower my rest. I have already paper tuned the bow and explained that lowering the rest would take it out of tune. He told me that is what other tac 15i owners are doing but I haven't seen any postings to support that. Any other suggestions? Waiting for a call from HHA to further address my issues.