What sort of problem did you have with the fork seals?
It seems strange that your shorter riders are having issues with the bars. I'm a shorter rider and have no such problems. It seems to me that the taller riders would have more issues than the shorter riders would.
We had a few of the fork seals leak. Nothing major.
The shorter riders had issues with the stock bars because they were having to lean forward too much. This caused two issues. 1. Fatigue to the back and wrists from working all shift in this position, as opposed to the more upright position of traditional police models. 2. Making tight turns is tougher when you are leaning forward, I am talking about bars locked turns. When you are sitting more upright, it is easier to turn your head back farther, thus making the turn "easier". This is no problem with the Helibars regardless of the officer's height.