Artifacts on v-minion in vase mode with 0.6 nozzle

I'm struggling to find why am I seeing artifacts when printing vase mode with a 0.6 nozzle on the v-minion.
- width: 0.85mm
- height: 0.46mm
- max vol. speed 13 mm3/s
- Dragonfly BMO + LGX Lite
- PLA

I've tried widths from 1mm to 0.85mm.
Curiously enough, these artifacts are consistently not happening on the perimeter facing front.

This doesn't happen with a 0.4 nozzle and 0.35 h / 0.45 w