You might want to check out Stack Audio Auva footers for the subwoofer (without using the spikes.) and their Auva EQ footers between the monitors and bass unit.
If you need to keep the monitors low, consider 50mm Soundeck Mk2 Minis Damping Feet. They are about 3mm thick.
Reviews for all of these are online, but I'm speaking from extensive personal experience. I don't comment often here, Erik, but I respect your contribution to this community. Thank you.