IS not working or what's causing the ringing?

I've been at this for days now and just can't figure it out. What ever I do I just can't get rid of the ringing.

These four parts are printed with exactly the same settings beside external perimeter speed which is 80, 180, 190 & 200mm/sec.
I was trying lower speeds when someone said the steppers worked best in the 180-200 range, hence the big gap in speed.

From the left: 200, 190, 180, 80 on all pictures.

To provoke the issue I manually put a seam in the middle of a smooth face and left the middle open.

My current (RRF) config is attached, the printer is a VCore 3.1 400, Hiwin Z1 X-rail, Vzbot head/extruder/hotend and a 6HC/1LC running v3.4.6.

I activate IS with this M593 P"zvddd" F61 in config.g and PA with this M572 D0 S0.04 from my filament config in PrusaSlicer 2.6.

The two IS graphs are on without IS but I still left the zvddd graph in there so you can see if it's a good fit or not. The other (lower amplitude) is with zvddd active at 61Hz.

I hope someone can help me fix these issues.
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