Does a fastflight string decrease spine? :help:
Yes. Depending on the bow 5 to 10 pounds more of spine is needed.
It doesn't decrease it but you will need more spine with a FF string.I had a bow that I went from dacron to FF and I was able too shorten my arrows by 1" too keep the tune of my arrows.
Depends on how many strands. If you make it heavy, it will shoot lighter spine. Using 14 strands vs. a Dacron string, you need more spine.