I recently tried both Spirocore Mid and Light tension(whole set), and I felt like Thomastik changed the way to make Spirocore. I now have Light set on my bass for about 4 months, and they are already dead!(no sustain, getting tighter). So did thomastik chage the way to make it? I don't know what it is, but it feels different. And, does anybody know good alternative for Spirocore? I don't like D'Addario. Thank you!