I've tried various half rounds over the years, and, in my opinion, they've never lived up to the idea of being in between round and flat in sound. Actually, they still don't, but they can have a pleasing sound nonetheless. Recently, when the ProSteels on my '90 Jazz Plus died, I decided to try some .040-.095 D'Addario half rounds since I hadn't tried them in a while. I was once again somewhat non-plussed by their tone, but I decided to leave them on for a while.
First, they are plenty stiff for the gauge. I recently used some Roto 66LC's on a couple of basses, and they felt much lighter. After a bit of breaking in, these sound to me more-or-less like flatwounds, but with their own vibe. So I've tried to appreciate them as their own thing, and not a combination of the sound of flats and rounds. Yes, they were sticky at first, but now they feel much smoother, again like somewhat coarse flatwounds. I think they'll stay on this bass for a while.
First, they are plenty stiff for the gauge. I recently used some Roto 66LC's on a couple of basses, and they felt much lighter. After a bit of breaking in, these sound to me more-or-less like flatwounds, but with their own vibe. So I've tried to appreciate them as their own thing, and not a combination of the sound of flats and rounds. Yes, they were sticky at first, but now they feel much smoother, again like somewhat coarse flatwounds. I think they'll stay on this bass for a while.