I've only tried one set of LTFs, the more recent set with the .075 A-string, and have had them on a P-bass for I think at least a year now. They've been great, no issues with any strings, and more bottom end than the TI flats they replaced. I've been thinking about adding LTFs to other basses I own since this first set was a good one.I had the ltf set on my JB2 for a couple of years, and found the G string exactly how you mentioned.
It didn’t seem to change much over time. A real shame, as I really love the other 3 strings.
(My set was the earlier one with the lighter A string).