That was a proper lead.
I went your route and under the LFO page put the SPD almost all the way up, MOD to TRG, a sine wav and, as you said, depth to the very opposite poles. I think though the key is MUL: it sustains at 512 and 1k but nothing else.
It was still “hitting” though so I then turned down the synth LEV. Bingo.
I had on my HD600s which have very tame bass. I switched over to ATHM50 and, yeah, head pulsing growl. Turn down the FRQ cutoff…Nasty.
EDIT: Thanks for your help!! (Sorry. I get too excited to work on it and forget my Ps and Qs.)