What would you say is a string that is about in the middle in terms of forgiving string easier to generate power like BG65 but loses it's tension quite fast and the BG80?
It you want something durable, inbetween BG65 and BG80, I think that BG65Ti is better than BG65. It's less spongy, have a feel that is closer to that of BG80, and it's almost as durable as BG65. I had a thread not long ago, where I asked about durable string input. Read that, and you will come across advice on trying the following strings: NBG95 (as the in-betweener you're asking for). Zymax 66 Fire (or thicker Zymaxes). For strings that are durable and playable. BG70Pro is mentioned - I have never seen that string, but it sounds like an alternative.
why not try tolson bl8000, has plenty of repulsion and is durable, availability in india is a pain but its a good string, i donot get hitting sound like i get in Bg66 or Zymx66 but its a nice string.
I agree that BG65ti is a decent string. I mean, I generate more power with BG80 even at higher tensions and it's more grippy for slicing but BG65ti is very durable and still decently powerful.
My stringer was out of BG80 so I got NBG99 instead and wow! I do like it a lot and what a power... I did try BG65 once but I totally hated it. I guess you need to string it at a much higher tension in order to be good but here goes string and racket's durabilities...