I have had the exact same problem trying to tune woodies. But my dynamic spin was way off. If they are fairly close, it works.
I am a huge believer in bareshaft tuning, when I can make an arrow walk across a target by changing dynamic spine, I believe it is in my best interest to get the arrow to shoot where I am pointing it. Not 12 inches left or 8 inches right.
When I first started making woodies (1994), took the advice of others. Just add 10# to your draw weight and there is your spine. Have at it, shoot like crazy, have fun, it's not that important anyway. They didn't always fly perfect, but OK. Screwed around with all the variables trying to get them to shoot perfectly, except changin the dynamic spine.
Then I got lucky, I accidently made up a bunch of wood arrows that were tuned perfectly to my bow.
My shooting, confidence, and hunting success improved tremendously. The light bulb came on.
So I bareshaft woodies, but you need to be close in your calculations first. The thing that seems to give the most trouble is the amount of centershot on any given bow.
Now whenever someone wants to try traditional, I tell them the most important thing is getting matched sets of arrows tuned perfectly to their bow. Traditional is enough of a learning curve, why put yourself behind the 8 ball with bad arrows.