Are you saying that chelated iron agrees with your system better than elemental iron?
I called the Barefoot phone # and they are very knowledgeable. I wonder if they can make you up a custom herbal mix? I don't think it is very high in actual iron, but more like, has very little in a natural form that the body can easily absorb. Like molasses, I don't think a tsp of their syrup would have very much in it, and barely a trace of iron, but it would be easily assimilated.
I bought some herbal liquid from the healthfood store when I was starving for iron a few years ago...didn't seem to do much and didn't have any better vibration than the iron pills I was taking. I think the freshness of the herbs make a difference.
I was kind of afraid to take the IP6, I am curious to know how you feel after the round of it.