I read on a french forum that KSB-65ti is similar as BG80, but a bit softer. Has someone tried this string?
Don't know. But I recently played with Kawasaki Elite 65. It's said to be OEM product from Kizuna. It's more repulsive than Kizuna Z65 & Victor 66N, though the string surface is slippery. Slippery strings do not control well, but they serve very well as cross strings. For hybrid string lovers, I think this is perfect for cross string.
I would say this string has the durability, control, repulsion and medium feel of the classic BG66 albeit with a slightly more coarse surface. It is never as hard as BG80.
AFAIC I find the KSB-65ti very different from the BG80-Power. I find it more powerful and not as hard as BG80-P (both strings have been tested on the same racket, same tension, same stringer).Unfortunately I haven't tested BG80 to compare directly.