Well I had the post-op visit today. Overall pretty good news, he said he got it all out and the margins were what he wanted to see so that was a relief! The "nuance" is that the total size was slightly larger than the original dermatologist slice biopsy showed, i believe he said in the .85-.90 range.
So while the margins were good, he said that statistically speaking the updated size increases the possibility of lymph involvement by 3-4%, so i'm now at somewhere in the 6-9% risk. He recommended doing to the sentinel node biopsy, as it is the only way of knowing 100% whether it has been successfully eliminated or not. He said i was "right on the line" of whether or not he would even recommend the biopsy, but he said that being on the young'ish side and overall very good health he thinks it would be the right decision.
I asked about the risks/damage of the lymph biopsy, i.e. is this going to permanently mess up my lymph system? He said that the chance of permanent issues was under 10%, while i do trust him i was just going to do a bit of research to make sure that is accurate. The prospect of a lifetime of lymph issues is almost as terrifying as cancer.
Assuming the lymph risk is genuinely sub 10%, I'm leaning towards doing it for some damn peace of mind. This experience has wrecked my nerves enough!