Jon, bring your uke by the shop and we can adjust the action for you. Your standard has an ebony nut and saddle, before we switched to Tusq.
The year the ukulele was built will definitely have some tonal differences. Our sound has been refined over time, and the current models are not as loud as the frontier generations, but they are a little fuller.
As far as structural and aesthetic changes, we had the same format from 1995-1998. I believe we revamped our production process in 1999, altering the body shapes and sizes. We also did an oval hole for about two months, before we arrived at the musubi. This came later, about 2001.
We started unibracing about 2001, as well, if I can remember correctly.
Mahogany necks came in 2003. Before that, everything was made from koa.
As far as the book matching of sides and tops/backs, we started with the sides in '01, I think. Wide quartersawn lumber became really hard to find around '04 and we had a 25/75 book matched to one piece split at first. It slowly went to 50/50 and gradually decreased to the point where one piece tops and backs are now a rarity. If a board comes in, I'll make some one piece, but those days are very few and far between.
While it's my family's business to make them, I'm not the best historian, so my dates may be a little off.