My slickness test is slightly different.
I use two wheels from the same batch unprepped because the difference in prep could skew the results. I then coat them with two different waxes, let it cure for a day, and put one wheel on each end of a fresh Tamiya swab. This tests the slickness under a certain amount of pressure.
Without pressure, I think carnauba wax would typically win. However, carnauba doesn't bond to the surface in the same way the synthetic waxes do.
I spin them and feel the difference between the two. I did this test a couple days ago and found one faster than to be noticeably more slick than the one I had been using. What I had been using was more slick than Red Rocket. Whether that translates into speed remains to be seen.