I knew a guy who killed 3 deer outright and crippled a 4th, with one 180 gr classic old style Silvertip. He said anyhow. HIs whole pary tagged out on it to make it sort of legal. He said. Anyhow......
Yeah, you're overthinking it. Slugs of 150-165 in .30 cal are typical deer bullets. Old school guys still shoot 180's and heavier, though not so much these days. My family swore by the old .35 Rem 200gr, and '06 RN 180's.
Yoiur load seems fine.