As mentioned, go to a CCC, which may in itself be a 2nd opinion, which is always good to get. Additional radiation Gy may be used in positive margins, LVI, PNI, but not sure about bone margins, which is not invasive, which may not be the same as soft tissue margins, but you have that too. Concurrent Chemo also may be used based on margins, and other factors like tumor size, advanced stage, which yours is. I had positive surgical margins, LVI, and PNI, and searched out my options, changed my treatment center opting for resection of the neck, and HD-IORT, during surgery, which is similar to Brachytherapy, and additional IMRT with concurrent Erbitux, and Taxotere. That's why go to a CCC, get a 2nd opinion. Good luck with everything.