Back in the day the Oasis GPX Carbons were my go to string. I found them to have the power, response and sustain of carbon while having some of the warmth and color of nylon strings. Be sure to allow them to break in for several days before assessing their sound. My only gripe with them is that after some time they start shredding like cheese string.
Speaking of fishing line, I've personally used seaguar fluoro premier line and they also make fantastic trebles! They actually sound very close to the Oasis GPX carbons, yet they are highly durable and will not shred, and they hold their tone for a very very long time. If I were to go back to carbon, Seaguar would be my top choice for the 2nd and 3rd then paired with a Augustine Regal 1st string.
What I am quite curious about is how the Oasis nylon line sounds compared to La bella 2001's, D'addario EJ45's, Augustines, etc. as I've never had the chance to try them.
"Success grants its rewards to a few, but is the dream of the multitudes.
Excellence is available to all, but is accepted only by a few." - Christopher Parkening