I was just trying to make you get post #13 for contradicting me. It worked! Ha.
But seriously, you got me thinking. I did try the Carvins a decade ago on a Carvin fretless 6 with only a piezo bridge so it's not really a fair test so re the Carvin/GHS flats listen to people who have recently tried them.
I can contribute this. I have been using TIs for a few years now:
They are all about prominent yet organic mids so while they are mid-pronounced, they are still smooth and natural. In a mix, they are right there - supporting with a voice - not mud.
Also, the TI Jazz Flat low B is the best B of any style of string I have heard; rich, focused, punchy and articulate. This is all based on a 35.5" scale NYBW Concert 6-string fretless.
Hope this helps.