Hi!
Here is a question:
Is there the same spine needed shooting a Carbon arrow contra a wood arrow?
(same front wight and feathers!
Ex: Out of a 50# Black Widow PMA?

Let me start out by saying I only use wood and I have tried carbons a few times. I have carbon shafts called whitetail 6075. They spine at 95+ on my tester. They shoot quite well (for carbon) out of my 51# ACS CX. The wood arrow I generally shoot out of that bow is an 80/85 POC or Fir with a 160 point.
So for a test I shot a 90/95 fir arrow with a 125 point to compare it to the 95# carbon arrow. At 25 yds they impacted the same; but that is fletched shafts, bareshafting they both showed stiff; so that tells me the arrows are pretty similar when spine tested the same. At home I am limited to 25 yds.

It is not my area of expertise, but I had the same question.  I can get a carbon shaft to shoot well out of several different lngbows, with different draw weights.  First they are thinner and there is some magic in them dynamically.  I started using GT pink cammos from a sponsor.  Easier to find in. This snow
An expert will explain the magic