0. Did you submit I-131 with your AzoS packet? If you didn't, I highly suggest filing it with a copy of I-485 receipt. It's free.
1. How did you find your civil surgeon? Was it on USCIS website?
2. Who says the vaccines expired? Civil surgeon? Did they skip some vaccines during your exam? This may explain RFE for I-693. Maybe try to get the list of vaccines from them. If they sound sketch, you may want to redo entire medical with a more credible surgeon from USCIS website. Understandably, it's a lot of money, but you may lose your status, AOS filing fees and few years of your life if USCIS isn't happy about the current medical.
3. Are you sure apart from messy forms, your joint sponsors are eligible to sponsor you?