PETG is a bit tricky. Plenty of threads in the forum succh as this one: PETG Issues
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Looks like it may be helped by using adaptive layer height (lowering the thermal input per layer at overhangs). You may also want to replace part cooling (to 10°) by Aux-cooling (to 70-80°) and go relatively slow (unless overhangs are above 75%). That should help with overhang warping.
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I still have that problem as well. Orca slicer’s Pressure Advance sounds like a good way forward but I am only slowly getting into that. Currently trying the old “coasting” option in Studio which is disabled in the Bambu PETG defaults.
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Are these the same problem? The lower line looks a bit blurred, while the upper line is pretty sharp. Do you have a flow ratio, cooling or speed change at those layers?