Sounds like a 800 on volume 2 to me. The 800 sounds your thinking of on records are turned up and multi tracked. If your looking for more gain you’ll prob need to get a harder clipping pedal than an overdrive. No shame in that if it helps get you the sound your looking for.
I don’t think the tone you have now sucks but I can see wanting more
If a Marshall sounded like this id never buy another. This amp is not proper sick yet. However it can be.