I agree with bowhunter50 on the fixed blade. Is there a reason you are not including them in your search? I am saying this for two reasons; First, you are only shooting 50 pounds, which may be iffy with a mechanical. Second, if your bow was tuned correctly with your arrows at 60 pounds, then your arrows may be a bit stiff for your current setup. Increasing the weight of the arrow tip will help this a great deal. You may have a hard time getting the correct weight with mechanicals (I have not seen too many over about 125 grain). You may have to go heavier then that.