IUI with donor success after 3 failed IVF

Looking to see if anyone else has had any success with IUI after failed IVF cycles?

My husband and I have decided after taking some time away from the TTC after our last heartbreaking cycle a year ago... and now we've decided to change clinics and try a whole new approach.

Our cycles are complicated, no once can figure out why we have low fertilization and no BFP with the few embies we had come out of our cycles. We are both 27 now (25 and 26 at the times of our IVF cycles) and although my husband does have Cystic Fibrosis, I am over all healthy, and through a TESE procedure, we had very healthy sperm from him! We did IVF with ICSI with each cycle, they all seemed normal with no complications all the way through egg retrieval. Then once we hit the day after, out of 12, 11, and 13 eggs the fertilizations were 1, 0, and 2. The Drs were stumped each time. Even when we took our records to another clinic for a second opinion, no one can find anything! However, We have heard from two different Drs that they have, in the past, seen couples with no success in IVF get pregnant pretty quickly with IUI and a donor. So we are kind of hopeful, but hesitant to end up completely heartbroken all over again. Just wanted to hear some hopeful success stories from similar situations to ours!!