OK I plugged everything in to the Stu Miller's calculator and it states I need a 51.7# spined arrow.  However, I use GT 33/55s cut to 30 inches with a 100gr brass insert and 175gr heads... the things fly like darts out of my bow and hit exactly where I look.  They spine 34.4 on the calculator.  Whern I use heavier spined arrows, or cut the 33/55s down they fly right and appear to be over spined?  Just curious if anyone else has found a much weaker spined carbon to fly better out of a non center cut longbow (JD Berry Vixen - 51#s at 27.5 and I pull around 28.5 inch draw)

sorry, I meant to say above..... when I cut them down or go to 55/75s they fly left..... not right and I shoot right handed

Dave, this question belongs on Pow Wow as it is more of a tuning issue. This is for shooting questions only. You'll get more help on Pow Wow.

Try pow wow, and I am almost always ending up with a weaker carbon than the calculator says.