I own a 3102, and am familiar with it's operations and it's weaknesses.. It can ba a good amchine but week at folding cardstock for the cover on your booklets. what weight paper are you using, also assure that the finisher is properly aligned, as they tend to float..
I am not a techand I am not faimilar with your code, but there is only so many areas that you can jam in the finisher,
I also found this post Di-3510 with FN-117, C0BA0

perhaps that wil assist.
Karl