Firstly, life would be a lot simpler if people actually read
the original thread (yes, all of it!) before throwing fuel on the fire in here; it's only about 10 pages long, and a lot of this stuff, such as the BoB video, has already been posted there (by me, on page 1 as it happens) and discussed at length.
Secondly, if we want this sim to be accurate then the performance of the Bf-109 is totally irrelevant in a thread discussing the performance of the Merlin engine.
I for one don't care about "balance" issues in the slightest; I want all the aeroplanes to be simulated as accurately as possible, and the relative performance that emerges from that is just the relative performance that emerges - I'm interested in flying the aeroplanes, not playing top trumps to decide which aeroplane is "best".