Morning @jululemon well done for making the most of your time 
Goodness what a big decision! Its not easy when they hand things back to us to decide.
For me because you said there was tumours on the nodes before chemo I would opt for taking a few out and finding out definitively what’s going on in there. There is always a risk with lymphoedema even just with radiotherapy but I think that risk for me would be worth it. Knowledge is power in my opinion. From the begining they’ve said how they want a clear map of what’s going on so they can treat it so if they have to do more digging then its all part of the treatment process.
Remember that is just my opinion. If you read that and you instantly think, oh no I don’t want that, then that is your answer. Whatever decision you make is the right one for you