I'm so very sorry. What a devastating thing to go through.
I became a Beer patient after 3 failed DE cycles & I had my 1st success with them my 1st cycle, on a FET. I would strongly encourage you to consult there, with Dr. Stricker in particular. They do not do ivf cycles, so they handle only your immune treatment.
There are REs who do both. I believe Minniet goes to a good one. I am biased, but I would consult with the Beer Center no matter what, just so you can compare the testing & treatment recommended. They will be the most comprehensive out there.
Other consult suggestions would be Minniet's RE & Dr. Karen Pace.
It is a difficult road to navigate, but a necessary one for a small % of women. It certainly appears you are in that group.
Regardless of who you go with, stay on top of your testing & treatment, & actively participate. Even with the best, you have to advocate for yourself. I could go on & on about this, as I had so many problems along the way, & a few even with the Beer Center, but that advice sums it up. Stay on top of things & follow your instincts. Period.
I wish you didn't have to go through this. I'm truly sorry, but I feel you will soon succeed, with your perseverance.
Have you found the Yahoo Immune Group board yet? It is not nearly as user-friendly as the network 54 boards, but it has a wealth of information & that is where you will find the women in the thick of the RI stuff. Many are still ttc with their own eggs, but it doesn't matter. Immune issues are immune issues.
If you haven't already, I would suggest doing the dna fragmentation test for your dh, just to make sure you don't have multiple things going on. Also karyotyping, although with other living children, this is much, much less likely as issue. Same with dna fragmentation, but for less than a grand, it's worth ticking off the list, IMHO.