So, when I uploaded this I went with a fairly minimal change to start with, to see what people thought before trying anything more drastic. Here are some changes I'm considering:
-- adding a basic mining job to the strategic resource building itself
-- increasing the size of the production modifier from 0.25 to 0.5
-- changing the ratio of +resource to -minerals
-- adding a few (2 or 3) extra max mining districts to the +2/+2/+2 deposit you get on relic worlds

Let me know what your thoughts are on the subject.