One cannot truly ensure that one will pass a polygraphic lie test, regardless of the format used. One can only do that which is possible to reduce the likelihood of "failing." With regard to the relevant/irrelevant technique, I have little in the way of suggestions beyond that which is already included in The Lie Behind the Lie Detector. A mild sedative might be helpful in keeping overall reactivity down, and scopolamine, a compound used in some anti-nausea preparations for motion sickness, can help to inhibit palmar sweating. But medications may have side-effects, and I'm not in a position to dispense medical advice.

In your case, if you are granted a "re-test" by the FBI, the relevant/irrelevant technique may well be used. But regardless of the technique employed, your chances of "passing" are approximately zero. As I've mentioned elsewhere, the FBI polygraph unit cannot politically afford to reverse more than a handful of initial polygraph results.

Under these circumstances, I think it would be best to adopt the "complete honesty" approach outlined in Chapter 4 of TLBTLD. The FBI polygraph unit will understandably have a hard time believing that anyone who has had a false positive outcome will not have researched polygraphy prior to any proffered "re-test." Denying having done so is likely to be taken as a "sign of deception."

You could demonstrate your sincerity by openly acknowledging that you've visited AntiPolygraph.org and perhaps even mentioning that you've posted here. The polygrapher will no doubt go through the monkey drill of administering the "test" anyhow. He/she probably has little choice in the matter. But at this point you have little to lose by adopting the complete honesty approach. If I were in your shoes, that would be my choice.