Hi,
Its not the engine, the very big propellers was made to be placed in a He111, they was made for slowspeed mainly, where they did create much thrust but also torque.
Additionally the pilots did talk about a nose-heavyness, probably the engine + propeller was to heavy.
Rumors say the landing speed was 190km/h.
All over it was propably the most horrible of all 109´s, nevertheless the IAF pilots shot down some SpitIXLF´s(Agypt Air Force) in close combat.
Greetings,
Knegel