"But what do you think?"
It's normal mole, follow your doctor advices
"Should I pursue this even further?"
No
"do I just let it go where it's at now?"
Definitely
Mole can developes anywhere in our skin, It still normal when it stopped growing (not getting bigger, not having an irregulare shape/border, no bleeding, no elevation, etc)
I once panicked when I got a mole at my sclera (white part of the eye).
For further reading, you might want to search more about ABCDE of melanoma