Thats funny,
I took your model from another program and did the boolean with it and it produced this result:



And then in the intersections you get this:



And this:



This is because the 2 curves are not the same length:

sweep rails=

490.562480799042

504.98067008109


Then I deleted the sweeps from the SAT file and re-swept the one with the seam edge facing "Out" in MoI, and mirrored it over to get the second sweep to boolean and produced a much better result!

Here's the file. :O

[EDIT] Also just took your SAT file into another CAD package and recieved the same error on Boolean operations with the second sweep! Could do one but the second would fail. didnt try to edit it to make it work over there. [EDIT]