One thing to keep in mind is that, as I understand it, the fluorocarbon low G’s have a wider diameter which might mean that you’ll need to file or sand the nut slot to widen it. I don’t have any first hand experience with low G fluorocarbons; I’ve only read about them, so It’s not impossible that I’m wrong.
Metal wound low Gs are about the same diameter as a high G string. I use a Fremont low G string which fits nicely into the high G slot. That way I can easily interchange the low and high G whenever I want.
Most of the arrangements here on Rockclass are written for high G ukes. Nevertheless, it’s usually pretty easy to change a few melody notes to let the arrangements work on a low G uke anyway.