Thank you everyone for your help. Especially I enjoyed Phil Starr's explanation of speaker development and it has taken me a long way towards understanding why they sounded as they did. One of the advantages, Phil, of being 73 is that I saw Free at the IOW in 69 and they were brilliant. I also owned a Marshall 50 watt in the late 70's, then traded it for a solid state, but I wish I still had it. My stage tone comes from overdriving the valve pre-amp a little, using the dirty switch on the amp, only using the bridge pickup (often turned to full treble) and playing with my fingers right up near the bridge, which as you know is hard work. I always ask for my cab to be mic'd, rather than DI, and I get a reasonably close sound to Andy Fraser, but it's still not clear enough and tends towards too much bass. I wonder if my bareface super compact could be some of the cause. One of their cabs can fill a whole venue by being multi-directional, and maybe this brings the room acoustics into the equation more. To be honest I am not very technical but I am grateful for any opinions.
Pic is me in 69 in my first band. Back row, left.