OT (except that I ran into this while visiting that page): That Beeline thing is really annoying. (I got the "blues" variant. I was annoyed enough by it that I modified the cookie to serve me a different version. I asked it for variant 3 ("gray1") and actually it doesn't appear to be doing anything; maybe that's a bug somewhere. Anyway, my apologies if this introduces noise into your A/B/.../I testing.)
'Blues' is actually the best-performing variant so far! I have no idea why, I hate it too. If it succeeds, I'll probably have to run another to try to find a version I can live with. 'gray1' is, IIRC, probably the subtlest of the running versions, so unless you set up a second identical tab set to 'none' and flicker back & forth, I suspect you simply weren't noticing.
EDIT: 'Blues' eventually succumbed, and the final result was no version clearly outperformed no-BLR at all. See http://www.gwern.net/AB%20testing#beeline-reader-text-highlighting
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.