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R2 = 4900  Gain = ~3.040816
R2 = 4810  Gain = ~3.079002
R2 = 4700  Gain = ~3.12766

So correct me if this observation is incorrect. When R2 = 4700ohms I was getting a ~12 W/m2 well after sunset and into the night. I increased R2 = 4810ohms and now I am seeing ~7 W/m2 at night. Does that mean if I increase R2 = 4900ohms that should give me ~2 W/m2 at night? Then I can set the clipping to 3 W/m2. Assuming, of course, the previous is true.