AM created a new version of the SC library which has the capability of doing Jaccard Coefficients, so I've been writing new versions of my scripts to see how those numbers stack up against mine. Right now I'm still not sure how to convert them to a scale comparable with NCD; I should be subtracting them from 1 to get Jaccard Distance, which is analogous to NCD, but some of the results are greater than 1, so result in negative numbers.