> The only thing that really stands out to me is that the difference
> between 2500 and 2480 is 20 instruction cycles, or 4 usec, and this

Do not forget that any count you do is never exact anyway. It is +/- 1 count,
and from the description you give, this 20 instruction variation you get is one
loop through your code which would be correct for +/- 1 count.

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