Fly line grain weights can vary a little (even between the "same" lines). I would take Wulf up on their offer. You might get a line that is closer to your old one.
I like the SA long cast line, but they are very different fron the triangle's taper. For the glx, I wouldn't get a line that is "heavy" ("for fast action rods). They tend to make a sweet rod like the glx feel ponderous and slow.
One cast can change your day...maybe your life.