Good thread.
My F112 seems like it could benefit from heavier strings (Has JP Silks on it?). It sounds angelic, but is lacking in overall volume, especially north of the D string. Otherwise it's great and plays chords in perfect intonation to the 14th fret, so I'd hate to lose that. I maybe should just make it up with amplification and leave it alone. It served me well through my biggest weekend gig of the year. In fact, I couldn't find it in me to play electric (live) the next day... I just wanted my twelve string.
On my other F guitar, the F30, I'm feeling the JP Silk and Bronze are muddier than the GHS Silk & Steels that were on there before. Brighter, crisper, that's what that guitar needs. It's a boombox. I think I'm going to have to switch back to the sound it used to have, even though I'm not crazy about the look of silvered or nickeled strings on an acoustic. They do seem to last a long time compared to bronze though, without any falloff in tone. I have a set of GHS Silks on my DC5E that must be a year old, all night Spring outdoor gig on that one, same strings, they won't die, still sound excellent. There's so many miles on these (learned Dust in the Wind on these and wiped out my frets) they practically need an oil by now.
On that one (Rosewood), I want to try the JP Silks and see how I like the sound, although I fear I'll just go back to the GHS S&S because that's the tone I know and love on this guitar also.