Dan,
You are also welcome to come over to Heartwood since you're not that far away - alumni get free consultations! We could look through the library at all the books we've been mentioning and I could show you some of the typical calculations for this issue.

About the end girt to carry the end of the flooring: we have often just put the first and last joist in about 3" from the face of the post (10" or so from the wall surface) and cantilever the flooring boards out to the wall. A trim board is much easier to attach after the fact than putting in a structural member, and the post is not compromised.