Bassman. You wont lose that much volume with a 20 watt option, and pushing the amp harder will increase flub potential. IMO, the real answer would be a custom amp based on a tweed circuit. The tweeds are notoriously over coupled and under filtered, and lack grid stoppers. These all contribute to 'flub.' Increase mains and screen filtering on the power tubes. Reduce coupling cap, and cathode bypass cap values, to adjust the bass cutoff from ~3hz, to a more reasonable ~40hz. Add grid stopper resistors to the power tubes. This will give you tweed minus the flub. It's also essentially what Dumble did when tweaking the Tweedle Deluxe. Amp should also take pedals above unity gain a lot better.