Poly only "lives" on average for 8 to 10 hours. Anything after that is going to playing with dead poly which in turn can/will lead to arm damage.
If you aren't a string breaker (which from your OP shows you're not) why not try natty guy? It plays great for it's entire life and the durability is great as long as you don't play in the rain with it / get it wet.
I believe what he says are nuggets of truth. And I collect them. And I store them in the lock-box of my soul. -JD