We use a Chroma loader and test harness to assess the quality of the PSU, and it enables us to evaluate the various facets for a PSU's technical excellence.
No problems on the 12V stability front. This kind of performance is only eclipsed by 80 PLUS Platinum-rated supplies.
Cross-loads are harder for a PSU to deal with because voltage is being concurrently applied to different rails at one time. Think of it as loading up your CPU, graphics and peripherals all in one go - a worst-case scenario.
Cross-load 1 puts almost all of the capacity down the throat of the minor lines while stressing the 12V line(s) with a couple of amps. The reverse is true of cross-load 2.
Again, good, solid performance here. No untoward dips in either scenario.