Nock height and spine

[Tedd]

I have been getting great arrow flight all summer with my Black Widow PCH  57@31. I settled on gold tip .340 traditional shafts with the standard insert and a 250 gr head.
I always keep a bare shaft in the quiver for a "coach". I am surprised how I can adjust the shown stiffness by moving my nock point up or down just a twist or two.
At my normal  1/2" nock height tonight my bare shaft was getting really weak. (weather or something) Two turns down on the nock points put it a 7/16 and stiffened the flight to almost perfect bare shaft at 25 yards.
I'm not sure what happens there. I would think lower would make more feather contact and make it show weaker?
Anyhow it really made the bow shoot. Something to keep an eye on and use for adjustment.
Tedd

[stonewall]

Could have been release or something. Mine shoot the same set anywhere from a half to 5/8.

[Jakeemt]

I have noticed something similar in the past. I don't really have a good explanation of why. Except that perhaps it's creating some kind of "corkscrew" effect.