I'm curious what you've tried that you've now abandoned? I've tried a handful of methods and haven't been very happy with many of them myself.

JetPack's publicize is seemingly the simplest of the lot, but gives almost no control over the end result, so either you like it or you don't. Bridgy Publish plugin has gotten much better recently, but my theme has some quirks to it that need some work to get things there working smoothly. Most recently I've been using Social Network Auto Poster which has a huge number of POSSE targets, but also requires a lot of set up time and configuration (and also relies on other plugins like All in One SEO or Yoast to set appropriate Open Graph Protocol metadata so that versions that get sent to Twitter/Facebook display exactly what I want them to--and even then it's not always 100%. I've been tempted to try Keyring next, but I suspect it'll be much of the same convoluted dance.

If most of my readership wasn't hiding in the silos, I think I'd give up on POSSE too. I can't wait until the broader idea has completely taken over to the point that syndication is a useless function.