Thanks for the update--that's great that the FCP numbers are down so much.
I agree with everyone else about keeping the mtx for now. I would even go so far as to say that it might be the mtx that has lowered the FCP so much.
Like you, we were hoping to take our daughter off mtx as soon as we could. A year ago in May, her FCP was finally in the normal range after a year of Remicade + mtx. We took her off the mtx, and 5 months later, she had a flare, with high FCP, pain and diarrhea. She had also started forming antibodies to Remicade. We put her back on mtx in December, and her FCP has dropped again, her symptoms have abated, and her antibodies are back to undetectable.
I know a lot of people say that mtx is just for helping to avoid antibodies, but for my daughter, it's also an important treatment for inflammation.
I do think it's very possible that SCD is also helping, but since you started SCD and mtx at the nearly same time, you can't know for sure. The hard thing is that mtx takes months to build to therapeutic levels, and then months to drop back down, so you can't just stop it for a month or two to see what happens--it will still be working during that time.
I hope I don't sound too negative. I completely understand wanting to get your daughter off mtx if you can. We wanted the same thing! But I did want to share our experience.