You should be plenty stiff on your arrow spine which is a good place to be. I never worry too much as long as the arrow spine is stiff enough. The two factors are now the shooter or the bow. Bareshafts don't lie about the bow or the shooter.
At 15 yards where do the BS impact in relation to the fletched? Saw that the kick left so I am assuming they impact right?
Move your rest back to spec for centershot so its not pointing way left or way right. Check your cam lean at brace, lay an arrow on the non-module side of the top and bottom cams. Having a slight lean of the arrow towards the string top and bottom is a good starting point as the cams will straighten out at full draw due to cable load.
If bow is in spec, good arrow spine, I try and start with me/shooter. Draw length may be long or a grip issue. With the bow at a good starting point, do some shooting. Play with some pressure changes in your grip, try a little more thumb or hand side pressure. I think you'll be able to learn some stuff about you as a shooter. And with a bareshaft you can actually physically see the difference little changes make. If your confident in yourself as the shooter we can look to the bow
Bow time! Yoke tuning saves lots of tuning headaches imo. Its easy and usually takes small changes to get the desired result!
If BS impacts left, tail right,- add twists to the right yoke or remove from the left
If BS impacts right, tail left - add twist to the left yoke or remove from the right
Whatever you do, do the same to the top as the bottom and it should work well