If it were me, given how long the road has been anyway, I would do what I could to go for the 2:1 option. Really for the reasons you stated: 1) wouldn't take as long to recruit to 2 recipients vs 3 for the same donor and 2) even though their cumulative success rate for 3 cycles is the same, I would imagine the success rate for cycle 1 or cycle 2 is higher for the 2:1 vs the 3:1 option, and I am all for getting off this horrible ride ASAP!!
good luck, FB! You so deserve to get the prize already!!!
p.s. I'm also pursuing fostering/foster-adopt so good luck with that too!