This is what I don't get either... the gain knob doesn't just go to 2 o'clock, it goes to 5 o'clock. If you don't have enough gain and the knob is not all the way up, *turn it up*. The knobs are given wide ranges for a reason, and unlike a lot of cheaper amps the Mesa gain range doesn't run out when the knob gets above halfway. There's significantly more gain between 4 and 5 o'clock, even. Likewise, why would you only run the presence knob at 9 o'clock or below? If you need more presence at low volume, *turn it up*. Second, if that really still isn't enough gain, *use the pedal*. It's not wrong to use a pedal with any amp, that's what they're for - it doesn't matter if the amp cost $200 or $2000. The Dual Rectifier is not actually an extremely high gain amp by modern standards - it was when it came out, but that was a long time ago and others have raised the bar further. I actually think my old Dual Caliber had slightly more. Finally, if you are having the problem with the 'step' in the MV response, then you could benefit from an attenuator. That's exactly why I use one. You *don't* need to crank the amp up all the way with it.
This is *not* like a Line6 or a Marshall MG - it doesn't have the same processed sound at different volumes, it changes as it gets louder. Forget about the knob settings - you have to listen to it and adjust it to get what you want, and all the controls are interactive, especially around the point the power stage just starts to open up - a tiny bit more volume and you'll need to re-adjust a lot of other things. This is not a fault, but it is part of the reason a lot of players put down Rectifiers and Mesa amps in general (and other amps) - they require more care in setting up and finely dialing in. It's no different to learning how to play guitar, you have to listen to what comes out and adjust what you put in.