You can either put a heavier fieldpoint like 200 or 250 on the front or use GT weights plus your point to weakin the spine. With 35-55, I cut them to 29 inches and use 125 grains of weights behind the insert with a point or broadhead weighing 125. By using the weights up front, you can get a heavier arrow that flies better. With bare shafting, I shoot at 15 to 18 yards to see how the arrow is impacting left or right to test for a correct arrow spine. If the arrow tip is pointing towards the inside of your shelf (right for rt handed, left for left handed) your arrow is spine is weak. Take off weight from the tip by using a lighter point or less weights. If your arrow tip is pointing away from the riser, the spine is too heavy. Put a little more weight on the tip end of the arrow. Once you arrow is hitting your target dead straight ( or close to it) into the target at 15-20 yards (hopefully where you were aiming asuming your knock height is set up right) you made it. Fletch up the arrows and have fun. Generally, if two different GT arrows fly well with the same weight combo bareshafted, I will set the rest of the arrows up the same way with no trouble. Write down the specific # of grains of weight used and arrow spine and length info for later reference. Once you arrived at that info, you can experiment with other shaft lengths, weights and such. I now use full length 55-75 (longer the shaft, lesser the spine) with 300 grains upfront to get the same spine that I get with 29 inch 35-55 with 250 upfront but with more weight. I hope this helps. Good luck Bhill