Air file engine position problem?

Hi all Got a FS9 WW2 light bomber Bleniem I think. It flys OK except that power increase makes it dive and reduce power and it climbs. I checked the CoG (reference_datum_position = 0, 0, 0, empty_weight_CG_position = 0, 0, 0) positon on the model and fuel tanks (about a quarter back from the models leading edge wing root) and center line from the side. Engines 3.62, 8.37, -0.98, tips of the spinners. played around with the engine height but I can't get if right. Other models seem to vary engine position from spinner tips to nearer the center line nowhere near the visual models engine.