Yooper, thanks for your reply - knowing there is debate and lack of consensus is useful information.
After researching whirlpool additions for flavor and aroma with reduced bitterness, i had settled on a 170-degree whirlpool addition to stand at 1/2 hour before chilling. But when I previewed the addition in the recipe editor at 10% utilization, but my IBUs when from the range of 20s to the 80s.
That seemed counter to my expected results, so I thought I must be using the editor incorrectly.