I have found several shafts that work well with my
VyperKahn. Mine is 47# @ 28". I draw a little over 27" so I am probably at about 45#. I get good arrow flight with 2115's and 2016's. You could probably use 2115's. I recently bought some Beaman carbons (500's) but haven't made them up yet.
Chris makes a great bow. His craftmanship is second to none. Mine is smooth, fast and accurate.
It is my go to bow. My favorite by far. I have a set of carbon limbs ordered for mine, 47 @ 27. It will be a while for these yet.
Good luck with your VK.