I see DPI get called at 55 (with my set) and NOT called at 60, but I like the "effect of 60" so, I'm going to go with something like:
65 OUT / 55 IN
Since you're torn between the effect of 55 and 60, you could go:
60 OUT / 55 IN
That gives you an "average" of 57.5, effectively "playing" like a value in between the two settings you're torn between, while using the value that gets the penalty called within CFM...
Might be slightly different with your set, but I'm most excited about the "blended values" that exist "between the fives"...
