I think that it would be very helpful, if you include your connections and diplomacy levels, since they alter your skills in-game (visually).
The formulas on wiki, work for base standings, but in-game you see the effective (after the skills), and only see the base on the tooltip on the upper right corner of the log.
The derived standing calculation works last time I checked it a few months ago. You can go thru the links below if you want more info: http://drs.darquan.ru/standings.html