Interesting stuff, ain't?
Shawn,
Thing is that my Griz Sticks AK outa the Morrison are "weak" with only 75 gr. insert and 125 gr. tips cut 29" with 28" draw! Same bow...have to shim out the riser some to get good flight bare shaft ala Adcock's website testing method.
Thing with the 5575 is that with the Morrison and the 54# limbs, I use exactly the same 5575 but cut 1/2" shorter to 29" even and only use 145 gr. tip with the 100 gr. inserts. 6# more draw weight and I only have to cut off 1/2" of arrow and can go with 15 grains lighter point weight. Go figure. Carbon just responds differently...
Guys with them engineering stuff behind their name one time claimed you have to consider "dynamic spine" vs. static spine... whatever the heck that is! ...so the bare shaft method showed me what I needed.
I agree with your statement about "good arrow flight" too. I thought for years I'd see a "kick" out of my shafts in flight...guys on ladders, behind me, etc...said, "Nope..perfect flight". Cut off feathers from half and tried that planning method and BOOOM... found all my shafts were shooting weak...
5575 took care of that easiest. and at 610 gr. total weight I'm liking that! Only bare shafts that fly like wires to 30 yards... I don't shoot bare beyond that!