The spine calculator works fine for me. Most of the time Stu is dead-on. Take care that you put the right values in; garbage-in=garbage-out.
My experience is that people mostly don't put the right values in the calculator.
I also shoot 45 lbs. I use Goldtip Traditionals 1535 (that is .600). Standard insert (11,4 grains), a 85 grains fieldpoint, standard nock filled up with some weight (21 grains total) and arrow length (back of point to valley nock) is 30,5 inches. My bow is cut 1/32 before center and I use a 6 strands string. I fill up the shaft with some foam (whole length) in order to reach a total weight of around the 405 grains, so I am at 9 GPI.
They fly perfect and that is exactly what Stu is telling too!
For my setup Stu says that your easton arrows are just a little bit too stiff (3lbs), but that is at a lenght of 32 inches (with insert and nock weight at 11,5 grains). Cutting the shaft would make it way too stiff indeed!
Further questions are:
- At what lenght do you cut your shafts?
- What do you fill in in the "Center-cut" box?
- How many strands is your string?
Especially the center-cut option is important.