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i am having this problem now. 2017 ss. it is exactly as described above. under a very light load(flat road) i can feel the rpms bump up and down. under a little more load like a slight incline it gets more noticeable and under a little more load it starts to feel like rumple strips. here is a log that i took. it looks to be the converter. also if i manually command it locked with hptuners it smooths out. the odd feeling timing matches the bumps in the chart below.
while the car with not completely warm it didn't have this issue and the slip was between 5-15rpm.
what a bummer. i have to now decide if i want to take it back to stock which at this point would be pretty easy and then hope they fix it for me or just buy a converter. a circle D converter is on my long list but i wasn't wanting to get one for awhile.
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