Hello there!
I think I encountered a bug regarding bezier-curves in Mocha AE. In particular angular bezier-“curves” where I supressed the extra controle-points for the “roundness” by holding shift while defining the curve. In Mocha everything works fine, but when exporting the Shape-data some “default-roundness” seems to get added so that the shape in AE isn’t edgy anymore…
I figured out that the Point-definition in the exported shape-data look something like Point(0.73852,0.409585,0,0.5,0,0.1,0.02,0) for all Points and that it should look like Point(0.73852,0.409585,0,0,0,0,0,0) for real angular curves without extra controle-points. As a work-around, I wrote a little java-tool which sets the last 6 values of each Point-definition to 0 and it seems to work for me, but I wanted to inform you about this behavior as it seems to be a bug. If you want I can send you my mocha-project file as further information…
And sorry if my english isn’t the best, it’s not my mothertongue. 
Thanks!