I don’t know if your 80 percent number is a bit high, but I basically agree with you. It may be an uncomfortable truth to say out loud, but the sad reality is that if you’re a conservative Christian of any stripe, many American Jews fear and dislike you a lot more than fear and dislake the Intifada types disgracing our college campuses.
Biden got 68%, lowest Jewish vote since Dukakis in ‘88, according to Jewish Virtual Library. Obama even managed 69% in 2012.
https://www.jewishvirtuallibrary.org/jewish-voting-record-in-u-s-presidential-elections