1.25mm poly? if durability is the only factor, why not go with a 1.30 poly or maybe a 15 gauge poly (whoa my arm just got a paint after typing that).
Also, just a thought, if you got a stringer that you could use anytime you could keep a fresh set in your frames. If you are working on really improving your game your not getting the most out of your training if your playing with overly dead poly, your just inching your way toward injury (maybe not now but over time). Kinda like it's a bad idea to practice serve with really dead balls.
4x Ozone Pro Tour. BHBR 54/52. Gamma Supreme OG. #64 RB...with only short term flings with KPS88, PB8 315, PDR, CAPed YT Radical, Rebel 95....