How far were you throwing those beat birds?
S-Line fd is a great fairway, decent hss and soft fade. Gstar TB has a very mellow flight compared to star, I suspect you will like them out of the box. The explorer has a similar flight to a gstar iirc.
I've been throwing the birds last season out to about 350 consistently, 300 on an off day. Honestly I learned to drive with a fairway with one of those new star birds 3 years back; and I wish I didn't. The majority of last season was throwing underatable/ stable discs trying to rebuild form. I didn't incorporate anything faster than my leapords until the last month before snow flew and I saw huge benefits doing that.
Either way, now I have an D line FD and while I don't throw it as much as my pro leapord, every time I do I love the thing. I have some seasoned star birds in the mail right now, but this season may very well be the season of the fairway for me. Explorer is on my list to try, as is a more stable fd, and perhaps the TL mentioned above.
Now that I type this who am I kidding, every season is the year of the disc and I just keep trying them. Whether they make my bag is another story!