Bill, thanks for the not-so-obvious tip! I learned about sensor cleaning after shooting the moon at midday, only to see the dust spots from my sensor at f32 which, of course, were not present below ~f16 due to diffraction limits. I will remember to clean the filter with my lens pen before hand.
I will also play with the angles too for your reasons stated. I’m sure this 15″ shot is going to take all afternoon for the setup. But I am looking forward to it. 🙂