Here's my opinion. In light of the fact that you do still wish to reconcile your M, I think you will have to stay w/ the 50/50 since that is what you agreed to before. Going down to 40 or less for her percentage will not endear her to you. It will also tell her that she can't trust what you say because you previously agreed to 50/50. At the same time, I can understand how it will take a lot of pride swallowing to hand that amt. of money over to her (and essentially the OM). But you are going to have to give her some amount of money anyway, right? The difference in amount will be several thousand dollars, which is nothing to sneeze at, and you have to decide how important that amt. is to you.
If you weren't wanting to save your M, my advice might be different, but I think here you need to ask yourself, "Will this bring me closer to my goal or further away?"
