Thanks for your quick help!
I’m still experimenting… but I think some of my problem might have been that I was following the advice in this thread: https://forum.audacityteam.org/t/help-me-with-rms-levels-and-mastering-for-acx/45593/16 which says to do the equalization last - doing it first makes a big difference.
I’m still fiddling with things and talking to someone at ACX, but I’ll post the final results of my experimentation.