I have spent hours in the National Archives chasing original source performance stuff. With respect to DH 2 Pitch prop there was little to find, though I am yet to exhaust the contents of the archives
. The only solid data I have found (so far) with regards DH 2 Pitch performance was some trial data of tests on a Spit IA with a "conformal" tank on the port wing. So obviously inferior performance to a clean IA. Even the Motherload document Avia 18/682 doesn't have much in this regard.
Here is the data for what its worth:
The interesting thing is Max Speed is being achieved at 2700 -2900RPM which implies Full Fine to me. its also 87Octane at 61/4Lbs Boost
At FTH 17,900ft its still getting 352MPH TAS at 3000RPM and 6.2Lbs Boost