Statistically, we see more recurrences in surgical only primary solutions than we do in a multidisciplinary treatment approach. Recurrences can be harder to deal with than the original disease.
No one can make this decision for you, but I do not think it is something you want to deal with again, nor have what your treatment team thinks is incomplete primary treatment. You have a team with lots of experience. My personal choice would be to trust their experience based decisions. At the end of the day it's your life, and even they will not force you into things.