On release the middle unit on the banner was 50% and the side banner units were 20%
as more mythics have been added this number has decreased drastically to 43.4% for the main unit and 17.3% for the side units. Rather than taking away percentage from main banner units you should exponentially reduce the chance for off banner units so the main units can remain consistent
(TL;DR take away percentage from units that aren't on the banner instead of the main units to compensate for new mythics being added)
