6400% and ambient 64 was too blown out. 32 was best of what I did. For the photo purists, minimum increments between stops was thirds, but really, why go to that length. This method is to get you into the ballpark.

Blotches were still an issue. The renders took about 13 minutes each at 3000 samples and an IC of 50.

This last image at 3200% and ambient of 32 was at 10,000 samples, and an IC of 99 and took 2 hours 16 minutes.

Oh, forgot to mention; all were 4 bounces.