OP, I'm in a similar situation to you. I'm meeting with Dr. Abbasi next week and then Dr. Humm at GW the week after. I think I am going to be done with SG soon (I am doing the ERA now and then have one more frozen embryo to transfer), so I will probably switch my care to CFA or GW if I like them better based on these consults.
One point on the ERA. You said:
4) Doing the ERA twice if it comes back unreceptive to confirm the results <because my Dr. said just do it once if it's unreceptive, not knowing if I need more than 1 extra day of progesterone-- we haven't been on the side of what works for the majority thus far so why not be extra sure?>
Here's how it was explained to me: If the first biopsy comes back unreceptive, they will do a second biopsy. For example, right now I am doing the first biopsy with five days of progesterone. If it comes back "pre-receptive" we will do another round and try seven days of progesterone. It doesn't make sense to have the first round come back unreceptive and then just take a guess at what the right number of days is. I'm surprised your doctor would suggest that.