I don't think it's unethical, actually, it's entirely within the rules. Mafia is a game of manipulation at its core. That being said, something about the way you did it sets me off. I don't feel like you needed to wait until the last possible seconds to do it in the first place, and in fact doing so makes it seem even more suspicious to me.
Actually, the fact that Espi is so ready to lynch you is even more concerning to me. I think we'd get more insight out of the situation from lynching you, however, given that you appear to be the orchestrator. But as I said, you are just a placeholder right now, given that I didn't vote last round. You're just a better placeholder than a random vote.
All that said, I'm eager to see UT and jcj give their responses.
PS: eljoemo, please don't end phases early in the future, to avoid similar siuations.