Here is my chart from May 2009 through yesterday. I had a good base build, slowly growing fitness from 34.8 in January this year to a peak of 80.4 in August just before a week long break. You can see the sharp downward slop. That took me to 68, then the Hermann Cross race. It's hard to dial that week in just right as I was not on the bike much but under heavy fatigue and moving around all day for a better part of a week. So I made some estimations.
Now comes the delicate part. Cross races started mid September I've created a plan to be fresh for each weekends race with a mix of endurance, intensity,skills and racing. Result is is lower training hours, fatigue drops and form stays near or above positive (which is what I want and has worked), but fitness is impacted in such a way that it slowly drops. I think I can keep this up for another few weeks but come State Championships in December I may not feel like I do now without building fitness back up a bit.
So now is time for a mini build for about two weeks. After this weekends Bubba Cross double header I'll recover and start this process but still balance this with a need to be fresh for weekend races. This should get me through the rest of the season not running on fumes.
The cool thing about all this is, if it does not work just like I have planned, then I make changes for next year and the chart will allow me to do that.