The rams extend all the way just before hitting drive extents (it's safe). But, when one ram fully extended the other ram is not fully retracted. It's about 1/8" from being fully retracted. Do they have to bottom/top out together perfectly?

essentially yes. it will take a lot of measureing and remeasureing to achieve this. if you truly desire this result, measure with very accurate device's such as large caliper's, or even a tram bar. this is also much easier when the gimbal is off the boat.

good luck.