I've been using the P-Line CXX-Xrta strong for mainline for the last year. I like it! IMO deteriorates slower than UG. I changed my mainline for steelhead even through it was probably fine. Fished that line hard for salmon all summer and fall and found myself cutting back above the swivel less often than with UG. Now, I'm not about to do something as stupid as switch main lines (esp one working so well) during steelhead season. But, when salmon fishing starts back up I like to try out new mainlines, new leaders, new knots, new weird flies and jigs I tied, and so on.
I'm curious why noone seems to use Chamelon on their baitcasters, just c-pins. After all, it is more abrasions resistant according to Maxima.
I would try Stren, however I'd try Seaguar's Senshi first as I'm a bit fan of their other fishing lines.