I am interested in this also, as I have 62" TD RC, that is about 2years old, and rated NON FF. IT has a cocobolo riser with a laminated stripe. The tips have 3 layers of black phenolic and rough Sheeps horn.
3 weeks ago I got my new 1pc RC from Dave, rated FF. When I was picking the wood combo's for the riser, i was told that I had to have some Dymondwood inthe riser, so I combined some Rosewood dymondwood with Macasser Ebony in the flared riser,and it looks just like Cocobolo.
Theese FF tips also have rough Sheeps horn, and 2layers of black phenolic, and between the black phenolic is 1 layer of Red material.
On the NON FF bow the 3 layers of black phenolic are slightly thicker than the 3 layers of material on the FF bow, and the Sheeps horn is also slightly thicker, on the NON FF bow.
Apart from the 1 layer of red material, the tips on the NON FF bow seem more robust.
Just my observation, as for using a FF string on the NON FF bow, have not done it, but am interested in this?
Dan