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You could try forcing the axis height by using a reference line (which could be hidden).
You could make a calculated field off of your parameter:
CASE [Age Bins]
WHEN 10 THEN 3000
WHEN 5 THEN 2000
WHEN 1 THEN 1000
Then you could place it on the detail shelf, add the reference line,
then remove the label and the line.
Thank you so much Swaroop! That works brilliantly!
I must say too - after some futzing with this, I realize that my intention is to show distribution, and the totals don't so much matter, so a percentage is also an acceptable solution, which avoid the complexity of the dynamic y-axis calculation (face-palm!)