Very interesting...
Keep this one going... I am watching this one carefully! I am a little shocked to see how differently my Seneca (III, TSIO-360KB) runs compared to OA's...
I climb, full rich, at 35/25, at 117kts (thanks for that mate!) and get about 500-700 fpm well into the FLs, and never trouble the CHT's above about 300.
When are you heading to Sydney next, OA?