G&L Bass ForumAddicts of Leo Fender's latest basses welcome here, as well as those interested in what drives the addiction to the basses from Fender Avenue.
I can't speak for the L1k, but I have a 90's/early 2000's fretless L2k custom with TI Flats, and they sound AWESOME! However, give them time to break in (I'd say a good week or so with regular playing time - gigs, band practices and whatnot) before passing judgment.
I had TI jazz flats on my 82 2000e for a while, but they "just didn't seem right", so I moved the TI's to my fretless and put D'Addario chromes on the G&L. IMO, I'd put the TI's on the L1K
I would put the flats on the L1000 since it's mostly redundant. If you ever wanted a roundwound sound from the L1000 pickup position, your L2000 will provide that.