I think you have to use all the advices at the same time, not only some of them. Maybe are they using some "super cookies", use BetterPrivacy (with FF), configure it, and download maxa cookies manager to see all the cookies you have (not only the http ones), and install the addon Collusion. in order to see the relationships between these cookies. Nevertheless, it were good for you to spoof your referer (use RefControl with only third party spoofed) , and to use "anonymizer nerver cookie", in private browsing mode..
If nothing work, they are using dark magic. If it's the case, try that (in latin of course, although aramaic were better) and immerse your PC in Holly Water, with the help of 7 priests.
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