I am a qualified Raindrop Technique practitioner in Australia. There are many new teachings since the original version of RDT was taught. Any heating is not part of the standardised RDT that is being taught around the world. Where ae you from? I know our teacher here in Australia travels to the US to teach there. She was personally taught be Gary Young and only one of 19 people in the world to learn the new modified technique from Gary himself.
RE: ticklish feet - try some Peace & Calming first. The feathering is meant to bring goosebumps so if this is happening then you are on the right track :)
You could try doing a search re oregano at www.pubmed.com there are lots of research materials there.
If you have the Essential Oils Desk Reference there are photos of x-rays, before and after, and the changes are amazing. Gary Young also brought some new photos to the convention he had here in Aust last year and the evidence was overwhelming. You could see the straightened spine in the after x-rays.
I am not sure about the lists so I can't help you there. Keep using the oils - they are great!