I don't know what the pinkish orange foam is, your guess is as good as mine. Two gallons is a general rule for the rinse but you can use more if you like. As for your concern to e sensitivity, I'm the same way and I run .5mg adex eod. But regarding the conversion, the benzoate ester attached to the estradiol should cleave off in an hour, leaving the estradiol to be water soluble and wash out in the rinse. Just be sure to stick to the 1 hour rule after you stir in your NAOH solution. After the hour is up, then start your cold dist water drip. That process should take another 30-45 minutes for the 500ml of water to form the crystals. Should be more of a clumpy consistency, white in color. Filter and rinse.
The only way to really be sure you got it all would be a melt test and I don't know off hand what the melting point of TrenAce is.
Did you notice anything in the kit that had a red/orange/pink hue to it? What all did this kit have in it?
Ok, and one more question: Did you filter out the crushed pellets after you soaked them in methyl alcohol overnight?