Nice article! For the decade test, did you try just four 10uF? I've seen others perform similar tests where four equal values were from at least as good to much better.
I have data collected for 3x MLCC 10 uF + 1x 100 nF but need to make the charts and update the article. Short answer is it's basically just as good and has fewer resonance peaks. I'd also like to do the test with some tantalum 10 uFs to throw in some ESR and see if that tames the impedance spikes even more.