whats the problem, that it doesnt get subby enough? then eq up the sub part on the lowpassed copy, up the resonance on the lp filter, overdrive it before the filter maybe. make a 2nd copy for the subbass and detune that one too.
if all else fails, just use a sine wave that follows your mid. there are of course bass enhancers but i dont use them that much, they tend to weird up the sound.
sure, its probably awesome. but what does it sound like?
under the osc tab, try enabling the 'restart via gate' option and have a tinker with the sliders if need be. i sometimes get that problem with distorted basslines using square/saw waves and solve it by shifting the phases.