FWIW, I had the same dead E string problem on my Icon series Club Bass - both with the cheapo Hofner Contemporary flatwounds, as well as with the expensive Pyramid-made Höfner flats. Isn't "dead E" their signature sound...?
On my bass it definitely wasn't a bridge issue, and I solved it by using LaBella 760 FHB2 "Beatle Bass" strings (039-096 gauge). They feel great, and sound glorious, no more "dead E syndrome".
I would have loved to try the Höfner-specific flats Thomastik-Infeld makes (as their JFs are by far my favorite strings on all my other basses), but even though I live in the city where they are made, they are impossible to find here (and their "short scale" strings don't fit - yes, I tried, with the set i have on my Guild Starfire bass).