Let's see if I can help with this one.
Kremmit is correct. A longer shaft can give you a longer throw, but only if you hold the longer stick at a greater distance from the fulcrum than you would the shorter one. A longer shaft can also do something else. It can give you increased leverage. Therefore, the spring tension, while still the same (it's a "constant"), feels lighter. This may make it easier to actuate the stick and make the throw feel shorter to you.
A balltop just feels better in your hand, and the translucent balls we use are just amazing in that regard. They are polished perfectly round and the material has a very natural feel. Not slick, but perfectly smooth.
A note on stick height;
Never forget that there is always the option of using spacers under the panel to reduce the height of the stick, if desired. This won't shorten the throw, but it will lower the stick to a level you find comfortable and is much easier than trying to modify the shaft.
RandyT