Rotating the cock vane

[Masboy]

I cut my arrows down an went with a lighter tip thinking they will be stiffer an not make much of a difference when I change cock vanes testing arrows but still changes the poi on most arrows. an this is from a vixen an wondering if anyone tryed the zombies for this? would heavier stiffer arrows still do this? I ,ll try putting a smaller arrow inside another an try that . did that before an shot great but I never played with changing the cock vane on them.