Homerdave -- you ignurnt snow-blind dummy! You wuntz akruccy, go get a durn turdy-art-sex! Geeze! Clearly, it's all yur falt, you durn dum bushrat.
Dave -- how you doing, pal? I'm having the same trouble and blame it, in my case, on "saving money" by buying cheap shafts at a trad bow show. Turns out they vary 50 grns in weight per dozen, and the spine variance is even worse. I'm going back to spending more on top-quality shafts that vary no more than 5 grns per dozen and are "multi-spined" at several turns for consistency. I've had best luck with compressed. I am now the proud owner of three dozen "economy" stump shafts that are pointless to shoot for practice, as a hit or miss means so little. Guess I'll take up flight shooting! When you guys get this figured out, please clue me in, eh? Yours, Clueless.