I have never done that A/B, but your outcome doesn't actually surprise me. You definitely should try them again with switched positions.

A wider range of source material and perhaps a wider range of listeners might give you a slightly different outcome. One thing I've noticed over the years, is that a simple smile from a participant in a comparison like this can affect the outcome. That said, I think your results are probably pretty accurate.

My experience with stock 43XXs has been one of disappointing imaging and a peaky midrange. With my slight to significant mods I have been able to satisfy my pursuit with my 4355s.