I recently acquired a second hand Martin Scepter 4 compound bow. Draw weight is 55-70#. I usually shoot more trad and my primary bow is a 50# Bear Montana long bow which I love. I got the Martin and I dialed back the limbs to 55# based on the Martin recommendations that one bolt revolution would reduce the draw weight by 3 lbs, so I unscrewed 5 turns. I figured I can pull 50# no problem, but I find with this new 55# compound I'm struggling. I can pull it back, hold it, and fire it with accuracy. I can shoot 24-30 arrows, but I'm tired by the end and I feel like I am exerting way too much energy with the pull. I figured I would be fine with 55# since I regularly pull the 50#, but this feels way heavier to pull it to the let off. I guess with the long bow, the max weight is 50# at 28# and with the compound the initial weight is 55# until it lets off, but I really feel like I'm struggling significantly more than I should be on the start of the pull and I'm getting fatigued. I'm surprised this 5 extra pounds makes that much difference. What's happening here? Can anyone explain? Thanks in advance for your expertise.