I like the Daddario Chromes too.. Even Feeling.
Years ago I tried GHS brite flats, and boy are they bright.
For real Dull sounding thud, i found these flats at
www.webstrings.com they are cheap, and sound like those cheap strings that used to come on all the old fender basses inthe late 60s and early 70s.. you know they had that green wrap but these dont have a wrap...