Wow, nice to see a fit for Maximus V Formula! I've been holding on buying since I measured 65mm with 2 titans on the top two PCIe(s) like your config (thou I think card wouldn't matter, right?).
Have you seen any improvement using 2 bridges?
I never realy tested and i highly doubt there is any performance gains, this is an ancient argument on the Forums whether they improve or not. i wanted the 3-way because it fills more space so i got 2x to kind of fill up the space. i always used 2 bridges anyways out of superstition it will improve