In your position, I'd likely put back two, but it's a super-tough call to make.
You had one failed cycle, which is not the end of the world, but you also seem to have some issues with fertilization, which could hint at egg quality. But I am always concerned about multiples, mostly because of the higher chance of miscarriage. I'm more afraid of miscarrying again than I am of having a failed cycle. Whatever you choose, I'm rooting for you. GL!