I agree with your explanation but your pad is far too harsh for me.
I was playing around again tonight and I ended up in the same place as usual… the mid range just totally disappear below 60-70 on filter 1, it’s like there’s just no low mids at all regardless of the waveform, so you can only raise that filter and do these sharper and buzzier timbres.
You do get improvements from using F2 as an EQ, boosting resonance on low mids. This is similar to the self-oscillating “bass boost” trick.
In both cases though, all we are doing is masking fundamental weaknesses in the signal! This isn’t good. I am more convinced than ever that something is seriously off with the oscillators and/or filters on this thing. People said this ages go and after a year i finally see it.