I checked out your thread
@Gondwanaland and can understand how confusing and complicated it can get when one is taking so many supplements (I'm trying to cut back as well), and have been indeed taking probably too much thiamine myself over the last year. (It helped me big time back in 2003, so I thought it would again.) But in doing so I may have depleted folate, so am backing off the b1, and increasing folinic again.
I've been dealing with salicylate issues for years (at least I think that's part of my problem) and have posted quite a bit here on PR about the thiamine/salicylate interactions (and sulfites, etc.), but also realized a few days ago that there is a connection with low folate/b12 and histamine. Methylation is one of the key ways that histamine is broken down, so that's another reason I'm going back on folinic.
I've seen that page by Weber before -- it's interesting, but I do worry about his emphasis on copper. Most vegetables are high in copper, at least compared to zinc, so one can end up getting too much copper rather than the other way around. But that's coming from someone who was diagnosed with 'copper toxicity'…so take it with a grain of salt.