Feints will throw Aramusha. 1,000%. Be sure you're ready for his feints, too. He can feint out of a heavy Opener into Ring the Bell, an uninterruptible which can only be side-dodged. He has a scary short window between a heavy feint and a Guardbreak as well.
If he hasn't struck yet, top feint heavy and counter his dodge attack. If you're trying to break a chain, heavy feint guardbreak (He'll attempt feint into Crosswind Guard, a full block with ludicrously strong follow-ups that can't be guarded against)