On the contrary Les had discontinued usage of the ADA MB-1 by that time. But he is using Mesa 400+ amps with 15" cabinets there. A rarity. It's a bit more gritty for sure.
TBH the reason nobody replied to your earlier thread probably wasn't that nobody could figure it out, but rather that we get posts asking for "a nice subtle bass distortion/overdrive" several times a day.