Recently purchased a 07 Guardian off the classifieds that came w/ a loop. My old Hoyt Magnetec I shot just off the string. Now, the BT is set at 28 1/2 but the loop would make it 29". I shoot at 28. I want to keep as much speed as possible, so should I drop the DL down to 27 1/2 and keep the loop or remove it and drop DL down to 28"? Any ideas.