If you can’t seem to get your cadence up, I’d work on it. There’s still benefit from doing low cadence work, it changes a little bit what’s physiologically happening, but it is still useful.
I find it a lot harder to drop my cadence that low, and have to make a point to work on it sometimes, because it still has benefit. IMO, anytime you find that you can’t get your cadence to do something, it means you should work on that. For you, that may be just focus on a minute or two at higher cadence, even if it’s hard. And then work on growing how much time you spend at 90+ until it’s not hard to do anymore.