After actually doing the math in Excel my goal is even closer. I should reach my Big Kahuna goal as of September 8th rather than October. Again, I'm no math whiz and I only use Excel when needed but the figure look pretty good. If I can format it correctly I'll link to it from DRC soon.
UPDATED
Here's the spreadsheet. It ain't pretty but it does give me a reference point for each week's weight loss goal.