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The shape of the string groove is more important the than string material used, imho. A nice tear drop shaped nock will distribute the load over a wider area. Same principle as making the string loop with more strands, larger diameter... more surface area. This shape almost presumes an overlay, because typically the thickness at the nock is not sufficient to accomodate a very pronounced or elongated teardrop shape. Also the string should lay straight on the braced bow, not angled around the string groove.

I've used FF on yew and hackberry and found it doesn't even make an impression in the wood, which one can easily accomplish with a thumbnail. Again, it's all about the design of the nock and the diameter in the loop.

FF plus is Dymeema, old FF was Spectra. FF+ came out because Spectra was being consumed for bullet proof vests. Dyneema is the material used for D97, and I suspect most string material. Difference being diameter, weave, wax content, etc. It is said the old FF was the lowest stretch when comparing apples to apples. That is, some strings are so strong per diameter comparing strings of same diameter but different material one could easily be comparing a 1000# (14 strand FF+) to a 2100# (14 strand 450+) string. This is in fact what going on when comparing a 14 strand B50 (560#) to 14 FF (980#) .

FF+ is ~$23 for 8900' (1/4#), B50 ~$8 for 4200' (1/4#). When you do the math the price per string is irrelevant even for the most miserly consumer. This being my predisposition. Also, when you do the math it's no wonder the more dense material (B50 being twice as heavy per lenght as FF) is "slower." Not to mention efficiency lost to string stretch during the power stroke.

Oddly with the premium material and particularly on bows with high early weight or "preload," string material can make all the difference, in terms of cast, noise and handshock. I think D97 may be nicer for most folks (I've found that to be true as well, depending upon context) because it may stretch a bit more than others.

Creep is when the string elongates permanently, over a relatively long period of time. This is demonstrated by lower brace height, partly due to design and crafting, partly to matieral. All strings creep but eventually stablize. Stretch is non-permanent elongation, while under load. Compare a B50 string and a FF, made to brace a bow the same. The B50 will be noticably shorter. This stretch is proportional to load, so when the string returns home on the power stroke, a more stretchy string will augment hand shock, or after shot vibration, as if it were a spring or rubber band.

To each his own, truly, but mischaracterizing the reality by parroting dogma serves no one.

Best pic I have showing the teardrop shape of a string groove and laying straight on a braced bow, 14 strand FF string.