cashflo2u2,
Let me rephrase what I think has been alluded to in a number of the above posts.
Typically with FireCalc, we look at 30-year time periods, the start of which rolls through the years, beginning in 1871 and ending in 1978 (the starting point of the most recent 30-year interval). Some of those periods start near market highs, some near market lows, and some in between. The FireCalc result we all hang our hats upon is the 4% WR which was safe 95% of the time. If one could run FireCalc (and I don't know how to do this without actually going in and looking at the individual 30-year period's data), I am pretty one would find that starting the "retirement clock" after the market had dropped 40%, would lead to a SWR in those instances which is considerably higher than the 4% number (or whatever number one used for a SWR - even a 100% safe one). This is why I think restarting your clock now (even with a 21-year time horizon) could be very misleading, because any failures FireCalc reports are probably the ones that started right around those same market highs.
If you retired in 2001, it looks like the market was down somewhere between 10% and 20% from its 2000 high. By choosing a SWR that was 100% safe back then, it seems to me you have most likely been sufficiently conservative.
This is my understanding of the way FireCalc works - I'm sure others will chime in if my interpretation is incorrect.