That's awesome information, thanks so much, Mark!

The 1.55k value has been working well for me so far, and I'll get some true 1.5k resistors in shortly to try that.

I've literally heard only a single pop all day since switching to 1.55k so I think that's going to be enough, and I don't need to go lower than that. The balance between "no noise" and "no risk of chip damage" seems to be good there.

My roommate's scope is only a 10 megahertz scope so I don't think it's going to be useful for looking at the signal, but if the 1.5k resistors work long-term then I won't need to.