There is a feature called Set Actions
which would be available in an upcoming version 2018.3
(now in latest Beta, to be released very soon):
It could be applied in your case (via a Hover action),
but it needs a Tooltip to be re-drawn to get the effect,
so a slight cursor movement (or a straight Select) would be needed:
Please find the attached (version 2018.3 of course).
To open the workbook, you may want to download the Beta 2
from the Tableau Pre-Release site:
bullet_charts_v2018.3_YF.twbx 31.9 KB
At least with a parameter action, changing your tooltip from Responsive to On Hover will give it time to show the Viz in Tooltop correctly, right away, no jiggle required, even for Hover actions.