I've got the Fender Sublime, you can get similar sounds out of the Bass Big Muff. I know you said no muffs, but you should try this one, it's much more low gain and vintage sounding, with bags of low end. In dry mode it blends in clean signal so doesn't take over your sound, although there is a problem of a volume boost in this mode, but it sounds so good that I might try modding it. The Fender has a built in blend to retain low end and note clarity, so maybe you should either look at getting a separate blender or checking out fuzz pedals with a blend built in. In which case check out the Wounded Paw Attack Goat and Wren & Cuff Pickle Pie B too!
Mammoth, Mastotron, Blowtorch etc, sound a bit too heavy and synthy perhaps for what you're after, Cameltoe.