There is a lot here. Lets start with the fact that 61% of your subjects received a "set1-set2" order and 39% (was 41% a typo or am I missing something?) received a "set2-set1" order. You mention that the p level of this is p<.01. Can you tell me a bit more here with regard to how that p level was calculated? esp., with respect to the type of analysis and n-sizes. Any specifics you can provide will help me to understand where the problem could be coming from.