Got it. Will do.
I would say back the throttle stop screw back more and re-set TPS again.So this is how it went.
We found the screw with the paint and unpainted it. While it does control the blades, opening or closing them slightly, none of that has the desired effect on idle rpms. Meaning, you twist it a bit backwards or forwards, nothing changes, until you hit a certain blade angle where the engine would abruptly jump from 1100-something right to 1700-2000. There's literally nothing in between and that's how it's always been. There's no gradual throttle "mode" on Brutales that would have a nice curve going from idle 1100 onwards, instead it would sit at 1100 while it can, then jump to 2000 and then go smoothly upwards from there. Which means it's the ECU controlling the idle, after all? I was hoping for some analog magic but it doesn't work that way.
We did open the valves a bit, reset TPS and did the balancing which went pretty well (it wasn't all that bad initially, just the rightmost two were out of sync with the leftmost two and another screw fixed that). And then nothing changed. So we brought the painted screw back (the best we could) and upped the fuel mix which was set to "-10" before and set it to "8". After we did all that the engine started revving down much more slowly and "in waves". Like in a wah-wah-wah kind of way. We'd rev it up to 8k and it would go smoothly to say, 6, then go slow for a moment, then normally down to 4, slow down there for a moment, then normally down and so on. Never saw that happening before. It was always smooth up or down. So that's problem number 1.
Problem number 2 is that it has a hard time going back to idle now while riding. Most of the time gets stuck at 2k and after a bit of prodding it may or may not go to 1100, only to get stuck again after you rev it up. Don't know if it's because we didn't put the screw all the way back or if it's something else.
The bottom line which is problem number 0: stalls when revving down still keep happening.