Thanks for sharing your workflow; it’s always interesting to see how others use these types of tools. I do post a lot of bookmarks publicly, but I also post far more privately. I use the categories and tags along with WordPress’ built in search to find things pretty easily.
For saving entire posts, I use PressForward to scrape and save the contents of the page, often pinging the Internet Archive to save an additional copy just in case the original changes/disappears. I used to use Instapaper and then Pocket, but lately have taken to using PressForward’s functionality as a feed reader and Pocket replacement though it wasn’t necessarily made for that purpose.