I've been doing something similar. I have different graph the on XLS (%position in the overall leaderbord, %delta time againstWR among those) and I'm working on a trend that should answer the question "Am I improving over the long run?".
It takes into a weighed consideration PersonalBest, Ideal, Overall ranking, Laps to reach the PB.
What I would basically like to see coming from this trend is "how easy" a reached a certain result and the fact that the given "certain result" is slowly improving.
Example: one year ago my typical TT of average difficulty started in bronze to slowly progress into safe silver. Now i start in dangerous silver to reach maybe 103,5% and it takes me less KM to do it.
The formula is still not as good as I like. May be the weight, may be the terms, who knows...
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