The other bit of information that may help guide the decision is your her2 receptor status. These days, with tripple negative breast cancer, many oncology teams are leaning towards chemo before surgery (known as neoadjuvant chemo). This can have the effect of shrinking the tumour to make a lumpectomy more possible. It tends to work well with the more aggressive cancers, too.
I think it would also be worth asking about this as a possibility. Tumour response is monitored throughout chemo.
Although I had oestrogen & progesterone receptor positive cancer, I was node positive, so that was my treatment path, which I was happy with.
Take care.
PS were you aware of the quake offshore the other day, when it happened?