As it turns out, it's no longer an issue, b/c through a very convoluted, but ultimately helpful, chain of communication yesterday, we are now able to keep that original August transfer and don't have to wait for a new date. Yay!
Thanks for relaying what you read about the timing. My doctor told me yesterday that it's usually done in the cycle prior to the conception cycle, so roughly 6 weeks before. He didn't think 8 weeks would make a different. I think there's still little hard evidence of this, so there are some differing interpretations and approaches. But the general idea seems to be gaining attention.