Could you tune the bow to shoot BH's and FP's closer together before you had the new string put on? Perhaps the cam is not in the right position now. You stated that the broadheads are 4" high. Is that at 20 yards, or how far? If I was planning on hunting any time real soon, I would probably just sight in for the broadheads and leave it at that. That said, your signature lists 2 broadheads that are known to be great flying heads which have the reputation of shooting right with field points, so 4" seems like a lot. Are you using a string loop, or shooting directly off the string? I ask because in '04, I was shooting a Darton Tundra off the string with a drop away rest. I was also getting broadheads flying a little high. Slick Tricks were closest to field pts impact, then Muzzys, finally Phantoms were hitting highest, about 2" at 20, 3" at 30, etc. with Slick Tricks maybe half that much off. I could not cure this with nock point or rest height, but did cure it by advancing the top cam by 1.5 twists of the control cable. Bingo, all 3 heads now shot the same, and also the same as field pts. out to 40 yards, and grouped well enough that I lost a $10 ACC arrow that I sliced with a broadhead by being too lazy to walk the 40 yards to shoot one at a time. In '05, I used a D loop, and did not have to advance the cam to get the same end result. I'm not sure about the cam on the Stingray, but the last 3 single cams I've tried to tune broadheads with were tough to get the way I wanted. All 3 seemed to pull the nock end of the arrow down into the rest, which would cause the high broadhead impact you are describing. I got high broadhead impact with drop aways, and low impact with a Whisker Biscuit with these bows. I got rid of the problem by going to a shoot through rest, which seemed to tune better than either the drop away, or the Biscuit with these single cam bows, none of which were a level nock travel single cam. If you are pleased with the flight and accuracy, you may want to leave well enough alone, but I do think 4" difference is a lot with those low profile broadheads.