I've used the Ti630, string it at 24. But only uses it for about 4/5 hours. From what I remember initially it feel dead, but the string does get better. Still I didn't like the feel, cut it and replace it with bg85.
Comparing with BG80 and BG66, these two strings gives better feel, at least for me. Currently I'm experimenting with gosen R4X100 string, another 0.63mm string .
I'm saying that BG66 and BG80 plays better for me than the Ti630, but currently I prefer BG85 .( BG85 on my main racket and R4X100 on my spare racket).
I think I have a thinner of the 2 RSL strings on my RSL X2AP and it seems okay. It's strung at 26lbs which is a bit to tight for me. I do prefer both BG80 and BG68 though, I can't explain why but I just seem to play better with those 2 Yonex strings. So I'll drop back to 25lbs and probably go with the BG68Ti.
yeah better use a yonex bg80 or 85 or even the bg68ti at around 25 lbs(vertical) x 24 lbs (horizontal) string tension. the repulsion it gives you translates to better control and more power when you hit the feather.
i don remember which string i tried but its the top end string of RSL....cut it off after testing it....deadbed...more use to bg66
