It would be very unusual for you to have oil in the reservoir and for the tabs to move but not go full travel. If the work they work, if they don't there's a reason.
If you can get them both all the way down and then measure or visualize them and then check the next day that will tell you if you have a leak. If they creep back up overnight there is a leak, either internally back into the reservoir, somewhere in the plumbing into the bilge, or the seals on the actuator.