Given that you had success with a SET (single embryo transfer) last time and you're transferring blasts rather than earlier stage embryos, I'd probably go with another SET if it was me.
We transferred one for our first IVF and FET, but we transferred 2 every time after that (except FET#2, because we only had one embryo). Thing is, we were getting BFN after BFN and I had never been pg (until a surprise natural conception between IVF#3 and #4, which ended in m/c). We always had embryo quality issues and never had an embryo make it to blast in the lab (tried just once with 6 embryos and ended up with nothing to transfer).
Our risk of twins was much lower than yours, so we were prepared to accept the risk. If our risk of twins had been as high as yours, I would have done SET each time.
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