Success! After many frustrating hours & attempts, I've finally managed to hone up my latest restoration - a near-wedge straight razor. Never had any bother honing any straights before, but this one had me tearing my hair out. A new 1000/6000 Japanese water stone did the trick, followed by a final run over my Belgian coticule.
Immediately stropped it up and it gave a lovely shave.
I'm one happy bunny.