Hi there!
I currently have an 6700xt and play only D2. Don't judge me haha. Anyways, I also noticed quite a bit of stuttering but as soon as I stopped using stock settings, that changed. You may notice the fps capped at 60, that's because my monitor is.. Bad. Anyways, when using the display of fps, it shows MUCH higher than 60, but I choose to limit them.
Currently, I'm running with this.
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(Power tunning is set to max, 15%)
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On D2, I mainly run Highest on most things, 140/5 render, can't remember exactly, I'll check in a bit and come back.
Anyways, I hope it helps!
Have a good day - Kahlimdor -