12lb 12lb 12lb... Damn get this out of your mind. Looks like an illness with so much reference.
There is no 12lb until very late in 1940 if ever. The 9lb MkXII shld suffice as an evidence.
Regarding the cruise, Rob I think you are cruising too fast.
At 0 (zero) boost I hve got around 200mph as cruise speed btw 15kft to 20kft and a very cooled engine that let me fight with half rad for nearly all the time full pow is needed in a dogfight.
Usually the 12hour needles is a good ref for WWII fighters both in boost and rpm. But I use 2400 rpm in general
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