It might be just me, but I don't hear a lot of difference between Pressurewounds and any other nickel round. I like them, for sure, but to me they are another variant of roundwound.
Cobalt Flats might be the answer; I think they occupy a distinct space between the normal round sound and the flat sound.
The one complaint about Cobalt Flats is that they go dead and do not sound good when they do. They use flatwound winding, but there is a bit of space between the winds on the larger strings. I figure this is done deliberately and helps deliver the brightness these strings have.
So, unlike normal flatwound strings, Cobalt Flats do go dead once you play them a while as your skin and oil accumulates along the winding as happens with roundwounds. If that bothers you, get two sets and cycle the dead set through a denatured alcohol soak for a day or two.