This is one of the sounds I alway try to create on any new synth that enters my home studio.
The first synth I made it on was a Yamaha PLG150-AN inside my CS6x (my first real synth).
I also did it on my MiniBrute, but wasn't so successful as you.
Through the years I learned that there are more routes to this sound.
On the PLG150-AN I came pretty close using the self oscillation of the filter.
With your patch as a guide I will try it on my Moog Sub Phatty.
For me this is the ultimate synthesizer sound, but for me Oxygene is also the ultimate synthesizer album.