Wotan,
When I tried it I trimmed the same as you, but couldn't get slow enough to lower the gear without rolling over and heading for the ground.
I was at a higher altitude field, thin air might have been the problem.
I enjoy the Mosquito in AH and have no problem getting a positive K/D ratio in it. However, its durability, and especially its flamability, don't seem to match the reality.
It does much better in a 1943 setting. It would also do much better in a setting where its opponents were historical. Even in 1944, the vast, vast majority of Fw190s were A series. In AH if I see a 190 I can safely bet $10 that it is a Fw190D-9. And this is ignore the fact that the Mossie has to deal with P-51s, Typhoons, Yak-9Us and La-7s in the MA, aircraft that it never had to deal with in WWII.