Oh lord! There are SO many factors that I can not even begin to go into all of them!
I would think that the odds are certainly going to be halved with the removal of the tube. As I recall, the ovulation alternates between the two ovaries. Have you guys looked into fertility drugs? They may force ovulation, I'm not sure, from both ovaries at the same time, but also may end up leaving you with multiple ovulations, thus potentialy lots and lots of babies. That, however may be pretty cool.....when they are all finally out of diapers, if you should be so blessed!
(And I certainly hope you are, cause that would be cool!)
Good luck!