Both my 20's really shine with the wad everyone loves to hate: fiber base wad. I start with a Type A hard card (to scrape the bore and help seal the gases), then a lubed fiber wad (overnight soak in olive oil) and top the shot with a single OS card. Leave out the Type A, and I start getting ragged patterns.
The distinction in using the fiber wads is in how much powder you're putting beneath it. Use less powder by volume than shot when using 2f, same volume for both when using 1f. Follow that prescription and there's none of the fabled "donut hole" in patterns the fiber wads are supposed to cause for the unfortunate users.
You also need to know I don't give a tired old rip about "tight" patterns with dense cores. My criteria is for a smooooooth pattern with clean edges and the shot evenly distributed across the pattern. I'm not trying to reach waaaaay out there or bash turkey heads. If I need more pattern density from a cylinder bore, I get closer before I shoot. No dreams of turning my ML's into modern performers.