Are drum samples typically extremely wide?
I've recently been using the metricAB plugin to view a few reference tracks vs my mix and realized my drums were extremely wide vs the references. Like even the snare and hat samples were pretty wide. Since they're all sharp transients, you can't really even hear the difference between wide stereo and mono, so lessening the wideness on almost every drum sample seemed to help a lot.
When you guys mix, how often are you changing stereo width? I didn't usually care until I started mastering, but it seems like I have to throw a utility (Ableton's stereo width plugin) on every single track and turn the width way down. It's one of those things I couldn't easily hear in a mix, but had to use an analyzer on independent samples to realize and I think it creates more headroom to mastering.