Hi Mark,
It seems about right after surgery. They would go to 72Gy, 7 weeks, without surgery or prior radiation, lesser in some trials. I had tonsil with lymph node (2) metasteses, but due to recurrences (6), i was able to do more treatments, radiation and surgeries, and now cancer free, which is more unusual than most.
They usually give the primary the highest radiation, and the effected lymph nodes, The other side and unenvolved nodes get lesser. I had bilateral also. Yours may be on the border to easily matestsizesize or large enough, and number wise where it can metastesise.