Well, I've put the Bass Tube Screamer back on the board to give it another shot.
I've also got an Aguilar Agro due in the post; I watched a couple of YT demos and coincidentally one appeared on ebay, so I put an offer on it. Aguilar pedals do seem to have a naturalness to them, space, air to breathe, so no harm in giving it a go... It'll sit nicely next to the Octamizer I've got on the board just now (lovely sounding pedal, but can't track below C).