I used to think a heavier grind worked better for multi day growth. I've since come to re-think that oppinion as I have some full and extra hollows that do great no matter what the growth amount is. I too have a beard where the hairs themselves are very thick and slow growing but my beard density isn't particularly high.

When I used DE blades though I had to be careful what I used as really only the Feather, Astra and Personna blades were sharp enough to shave me comfortably without any tugging.