My Funk Bass patch sounds similar to the one konspirativ posted.
Audesi, did you try the stuff I suggested. Do you have anything connected to the VCF input? The mod wheel isn't active on filter cutoff in this patch, so I think that isn't it. What does the Filter Env amount do when you go negative. Does it bottom out at position 9?
I would think that one notch of the scale is just the analog differences in parts. Every MiniBrute will sound a little different as every MiniMoog did.