All of those would require changing the constitution and the structure of congress (basically impossible), and wouldn't work on things like presidential elections to begin with.

I also have other issues with them. Like runoff voting systems drop a moderate candidate that most people would prefer in a 1 on 1 election, but isn't listed as enough people's second vote. Resulting in more extreme, less liked, candidates getting elected. It's better than FPTP, but not by much.