We recommend that you use the top of the green MP as outlined in the POH for your aircraft and climb full rich.
Intuitively, I agree. Certainly in a NA or TN engine there are volumetric efficiency benefits from WOT.
But, I like the graphs in the CMI OM - especially the older ones which are not straight lines and look like they were hand drawn from empirical data.
The TSIO 360 EB graph (which I believe is the same engine as the TSIO 360 KB, but with a lower redline RPM - 2575 rpm vs 2800 rpm) is pretty interesting when you hand draw the KB curves on the top. It looks like someone took the EB curves and made them into straight lines for the KB.
On the EB graph the fuel flow rate goes hyperbolic from about 90% power. If I run the power settings that most guys use - 35/2500 this is about 86% of the rated 200 Hp (40/2575) but has a fuel flow of 113 lb/hr vs 140 lb/hr for full power. That's a 19% reduction in fuel consumption for a 14% reduction in power.
So, wouldn't it make sense to climb at 35/2500 (86%) or 35/2575 (88%)??
Interestingly, the KB engine has a note for power settings in the range 150 Hp to 180 Hp which allows leaning to TIT 1525 degF conditional upon CHT < 420F & Oil Temp < 200F. I think this would lean the engine to the best power line, which seems too lean to me.