After listening to a flat wound comparison video on Youtube (with an MM Stingray) I was impressed with the Galli JF 4505 Jazz Flats. So was the guy doing the comparison test, by the way... So, I put them on my MM 4HH Stingray Special. While several people here have been... less than impressed... with them, quality-wise, I have no complaints at all. However, as far as flats go, They're not at the "other end of the spectrum" from La Bellas or the GHS Precisions - both of which I use (and really like) on other basses. I'd class them more with Fender 9050Ls; modern and middy, but with a little more bottom end. And they are smooth as wet ice; balanced tone-wise; and respond very well to an active bass's pre-amp settings. But, if you really want more highs? Then, yeah; go with rounds - although, IME with Boomers? Great strings - especially on a T-Bird - but not exactly the rounds I think of when I think of "bright". In my limited experience with rounds, "bright" would be DR Sunbeams - or TI Jazz Rounds...