RE: knock travel
I agree with the above, but I have to say that basically in small amounts uneven nock travel is not a problem for most shooters.
Level nock travel is a term coined by a certain bow company in regards to Mathews single cam system. This company chose to use a different cam system which they advertise as a 1 cam when in reality it's a one cam and a round wheel. Nothing wrong with either system and they do both work.
No bow that I've ever shot has perfectly level nock travel, including recurves. The reason is that there's always more load on one limb or the other. As long as I perform the shot the same each time the bow will consistently shoot the same.