VA, I'm seconding pretty much all that's been said. Many here are far more experienced, I'm just five or so years into the learning curve. Along with all the stuff mentioned - and it's all good - I'll chime in again that I find it best at this point to not get too hung up on paper or bareshaft tuning… too frustrating tip we get our form solid and consistent.
Doesn't mean not getting good flight- I just do better working with arrow flight as I watch 'em fly. I struggled with corkscrewing
for a while too, so I can relate. Kinda frustrating. For me, I think it was a combination of brace height, nock height, and less than optimal match of the arrows. Also any misalignment in point, nock, or fletching.What poundage and bow are you shooting? Might be kind of marginal for correct spine, when we get some good and some bad flight.
And about the arrows - personally, I've ended up doing better with woods than carbons; other than just liking 'em better I find I'm better able to tweak the arrows, with more predictable results - and I don't need a cut off saw or shop to cut 'em for me. I KNOW others prefer carbons or aluminum - with good reasons- just a thought for 'ya.
Oh and one more thing you may want to check out about tuning - I've gotten a whole lot out of reading the tuning tips on arrowskp.com. No paper or bareshafts involved, and some good reasoning about why.