WB,, I didnt mean to shoot right handed,, just maybe flip the bow over and see if it shoots better on the other side,, the way your handle is made may not allow that,, just a thought,,when I make a bow ,, I shoot it off both sides to see which way I get the best arrow flight,, if you are not drawing the bow to 60#,, then it would call for a weaker spine arrow,,
in my experience,, a 60# bow will shoot a 60# spine arrow depending on how long the draw is and how long the arrow is,, usually the persons release has alot to do with how the arrow flies,, its not all the arrow and the bow,, its not that simple,,,as your release gets better,, you will see you can shoot a wider range of spine from your bows,,
if I made a bow that was pulling 60# and needed to shoot 35# spince arrows,, I would be double checking the string alignment,, and brace height,, first,, it would indicate something might need adjustment,,not just the arrow,, as you stated,, it may be your release ,,, I am just going from my experience and it may not apply to what you are experiencing,, best to you and your shooting,,