Based on process of elimination above, it looks like Jay's spinner could be the culprit. You could get rid of it, your dac, etc and get the Technics SL-G700mk2 (sacd player+dac+streamer all in one), for example. Some good engineers at Technics already did all the cooking in-house so you don't have to be the sibilant fatigued chef.
Other considerations: it is quite strange that the Lokius did a whole lot of nothing to help... You sure you didn't have the eq defeat on while tweaking knobs?