Which brand of fluoros are you referring to? I believe a great number will disagree with you based on their own experiences with them. Some prefer one brand over another while some will favor nylon or in your case, gut. I also believe the build and wood combo will play a factor in sound.
I just got a set of SouthCoast HML-FW (Flat Wound Strings) for my Griffin ukulele. Amazing Clarity and Sound. I've been a SC Linear Fan using the Round Wound Series but Dirk sent me a set and I am pretty amazed. I think these will now replace the Round Wounds going forward.
I've seen lots of post about polished and squeak free strings and never imagined I would use them for my Low G setup but I have to agree with everyone now, they are nice on the fingers.
Put these strings on your list to try - I think they will amaze you.
I really like the sound of my tenor uke in Bb tuning. Unfortunately the strings I have on it right now lose their intonation when tuned down to Bb flat from C (in Bb tuning, the reduction in tension on the open strings currently fitted means that every fretted note goes badly sharp).
Are there any tenor string sets in the list that can cope with Bb tuning, that anyone knows of? TIA.
Steel strings aren't really an option for ukuleles built to support nylon/fluorocarbon strings. Steel strings produce much higher tension than non-steel strings and can damage an ukulele not built for them.
What's difficult about the question is that "loud" comes in several flavors. My own experience is that Aquila nylguts are the "brashest" strings. I prefer fluorocarbons -- Oasis and Worth, for example, which are loud to my ear without sounding harsh. But as someone pointed out earlier in this thread, build is an important factor. Every KoAloha I've ever heard is loud, seemingly without regard to what the strings are made of, although I'm sure some strings sound better on them than others.