I used to think Ashdown amps lacked volume but learnt how to use them and would say there are a couple of things to consider:
1. The Deep switch will suck power into producing low frequencies. This is a similar thing to the Shape button on the ABM
2. It’s not clear from the pic or your description if the Sub Harmonic is switched in, but if it is in it is being pushed quite a lot and will also suck power.
I’d be inclined to reset everything back to noon on the EQ, switch out anything like the Deep and Sub buttons and start from there. Cut the bass control, boost the mids and don’t be scared to drive the preamp hard with the Gain control. See how you get on with that