I've got good news and I've got bad news.
At the urging of George Furlanetto, the maker of Fbasses, I decided to try Thomastik-Infeld Electric Bass Nickel Flat Wound Roundcore 6 Strings (.033 - .136, JF346) for the first time. He said that Alain Caron likes them, so I put them on my 6 string fretless Fbass AC6, the Alain Caron model.
The good news is I LOVE them.
The bad news is these strings cost an arm and a leg.
Please, someone tell me these strings last a long time!
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First I recorded some familiar lines (without caring how well I played them, obviously) with the stock Fbass exposed core roundwound strings, which I understand are made for Fbass in special gauges by La Bella, then I recorded the same bass lines again (more or less and just as sloppily) after I changed the bass over to the TI flats.
To help me compare the two tones, I then mixed the two recordings so that I could first hear the Fbass roundwound strings, then the same line done again with TI Flats.
The recordings are straight from my bass to the computer and are totally untouched, no eq or other processing.
So the first time you hear a line, it is with the roundwound Fbass strings, and the second time you hear it, it is with the TI Flats.
I really like Fbass strings, so it is remarkable that no matter the settings on my bass or the style of the line, I pretty much prefer the Thomastik Jazz flatwound strings. That's true when I play on either the magnetic pickup, or with the piezos.
Again, I hope they last a long time, because at $80 to $90 a set, I wouldn't be interested in them otherwise.