@mistyl - Thanks for your continued observations on this phenomenon with the B100P.
One approach that may help: ala your 4G Soft idea, try a few physically-tougher, more controlled, lower-powered, more playability-stable co-poly's, at lower tensions. This will hopefully do two things: 1) give you a string that is physically more resilient to wear and 2) allow for less tension/DT loss available to begin with. The hope is that the combined effect could unlock enough playable longevity to make the B100P sustainable again.
That said, this actually brings into focus a select few newer co-poly's (like maybe
Grapplesnake Tour M8, which is quite the workhorse), but mostly some of the more old-school, earlier-gen co-poly's, that, compared to a lot of the newer stuff, tend to be physically beefier (often to their simpler, denser formulations).
4G Soft is certainly one such option (even
regular 4G, tensioned even lower). Others would include
Head Hawk (and that's
regular Hawk, not Hawk Touch, not Hawk Power), which is incredibly dent-resistant. Also potentially
Kirschbaum Max Power. And if you
really want to go planky, dead and physically impervious,
Dunlop Explosive Speed — the highest tension-maintenance co-poly ever measured by TWU (but MAN is it an absolute dead board, even by 4G standards, so be
extremely careful with tension if you try it).
Would be interested to get your take on any one of these, perhaps strung around 40-ish, maybe even into the 30's for the really firm stuff, and whether they offer enough initial and/or lasting playability.