Ripples with 1mm nozzle

[the_schire 3]

Hello everyone, so the original nozzle that came with my UMO eventually got so clogged that I had no choice but to drill it out. The smallest bit I had was 1mm, so I went for it. It's a little bit bigger than stock, but it seems to be working fine for PLA and TPU, but I'm getting some very serious waves with PETG. I got a spool of Push Plastic blue PETG, and it seems to print great until about the tenth layer when I start to get little waves in the walls of the print. Please send help, I've tried a bunch of different settings, but I can't figure it out.

Printing at 220-240, tried with cooling on and off, bed at 55-60, speeds from 50-60mm/s, flow at 98%. I was thinking that it was the skin overlap percentage, but I was still seeing ripples at 2% overlap. Thanks, everyone.

[the_schire 3]

Oh and 0.2mm layers