Either you mis-scored McCooey's variant or you intended a scale with bigger brackets ...
Thanks for your interest and for taking the time to examine the figures.
I've rechecked the figures and they look OK - though I might still have missed something.
I think the problem might be in the way I've calculated the 10% and 20% ranges, where the percentage amounts were rounded to the next higher integer and then added/subtracted to/from the match-target. I've extended the table to show the ranges.
Thanks for your interest and for taking the time to examine the figures.
I've rechecked the figures and they look OK - though I might still have missed something.
I think the problem might be in the way I've calculated the 10% and 20% ranges, where the percentage amounts were rounded to the next higher integer and then added/subtracted to/from the match-target. I've extended the table to show the ranges.