I am traveling too, but to Czech Rep. I had two fresh cycles which failed and in both instances I transferred two 5-day blasts. The donors were first time donors, young, the first had a child already so I considered proven on that basis but the second donor was not proven.
Then, the third cycle I really considered transferring three due to my previous lack of success but my donor for this cycle was proven with one lucky recipient before me currently pregnant and I was to be her second donation cycle. So I took this as better odds and decided to stick with two again and not put back three. I have one frozen blast out of that cycle. The great news is that I just got bfp on home test and go for beta end of the week! So I am glad now I only went for two again.
Good Luck Pip with whatever you decide.