This system is still new, please save any experience reports, incase we still have errors we haven't found. This message will be removed in July 2018 or after 200 solid entries, when we feel like the system has proven to be stable and semi-bug free.
All of the "personal" information like height, weight and age are optional. It is just so we can use the data or help others gauge result by weight by catalyst. The more data we have the more we can use to find patterns.