Here's a little different way to do it. I like my arrows to extend one inch beyond the riser at full draw. For me, that's a 29-inch arrow. First, I buy shafts that are in the ball park re spine. You're in the ballpark with yours. Then, I cut them to the length I want -- 29 inches. Then I play around with point, insert and adaptor weight and maybe the bow's side plate to get good arrow flight.
Usually it doesn't require much tinkering. A 100 grain insert, 25-30 grain adaptor and 125 grain point usually gives me the physical weight I want and good arrow flight. With insert weights ranging from 25 to 100 grains, adaptors ranging from 25 to125 grains, and points ranging from 100 to 300 grains, the combinations are just about endless for tuning an arrow to the bow, and you only have to cut it off once. If you want to try it, start with one arrow and see how it goes.
Whatever floats your boat. Good luck.