I fully understand the 3555 recommendation, but I shoot a 47lb recurve, and the 3555's I'm shooting right now require me to remove all the extra weight I like up front, and are still showing underspined with only a 125 grain tip, cut all the way down to 28 1/2" (I can't go any shorter), so I'm leaning towards 5575's too - but as Bowspirit and jacobsladder point out, I'll probably have to leave them full length and add some weight up front, or they will be overspined.
Although I've been a long time GT fan, I'm looking at other choices right now, as I just can't seem to get a GT to shoot right out of this setup of mine. Just got some AD Trad-Lites and Grizzly Stik Sitkas to try out, and so far, I'm impressed by both.... but man... they are expensive!
I did a poll on here a while back, and the Carbon Express ran away with the votes. I think I'd try that CE 150 before switching over to the 3555's.
Or... if you still have some full length 5575's, I have a few 3555's I could swap you for so we could each do some testing. My 3555's are traditional blems, but they are in really primo condition (I can't tell them are "blems"), and I have about a half dozen new uncut shafts left.
All the best,
Glenn