After several weeks and hundreds of pounds, I have made a few modifications to my worm harvester. The first thing I did was replace the 1/2 inch hardware cloth w/ 1/4 inch screen throughout. The 1/4 inch screen keeps the majority of the worms out of the catch tubs and sends most worms to the end bucket along w/ the larger sized material. I still have to spend some time picking through the worm castings for eggs and baby worms. Using this method I have been able to speed up the process of separating worms from castings considerably.
Another change I made was adding a scrap piece of particle board to the front end to make loading easier and to prevent back flow. The only other modification was to tweak the angle slightly. I have the end pieces bolted so that I can adjust the height, also I can add blocks underneath to change the level.