I don't recall anything on the Wiki for your situation, RL, but you might find something I overlooked.
If the 4 presets
named "Clean", 1 Basic Bassman Clean, 8 Clean Focus, 11 TV Bassman Clean and 22 Bassman 300 Clean (possibly with deep EQ adjustments), or some of the Dual Showman or Studio Preamp presets, don't get you clean enough, then I dunno what to say. The Stage & Studio amos are not limited to the familiar Rumble tones at all.
While I
never recommend changing speakers to achieve different tones, especially on such a multi-tonal modeling amp(!), I
am impressed by how many Rumble 800 combo users say that its Neo speakers sound cleaner, more articulate, than the Rumble 500 combo's ceramic ferrite speakers.