I know a person or two who had limbs delaminate on Big Horns back in the 80s. Wasn't a big problem, but it happened occasionally. That was before fast flite; they were all using dacron. I had several T/Ds and one-piece bows in the 80s and early 90s and never had any problems with them.
More recently, I have owned a Bighorn or two from the 80s era. I put D-97 on them, padding the loops. No problems. The overlays on those older limbs are quite large. Aside from loop cutting action if the skinny fast flite type strings are not padded, I feel the low stretch properties of the strings are actually easier on the bows than dacron. They make the bow quieter, faster and reduce limb vibration.
Given that the bow was made before fast flite, using a fast flite type string is certainly a less conservative approach. You'll need to decide for yourself.