This is indeed with EXPO! There were great strides made with firmware revisions in the last year or so. I do have to make a point to boost the supporting IMC/S

This is indeed with EXPO! There were great strides made with firmware revisions in the last year or so. I do have to make a point to boost the supporting IMC/SOC voltages before enabling that, or I can get a bit wedged. The profile voltages (and clocks/timings) for the sticks themselves work fine - just the board/CPU itself needs some care.