I was just looking at the shaft and propeller, it seems to have a downward angle. Would this not result in the propulsion trying to lift the stern upwards and driving the bow downwards? My experience is limited to power trims on sport fishing boats but the results of trimming in and out would apply here I think.
If anything, this would be moderately beneficial - a ship of this configuration and power level tends to 'squat' and trim by the stern at high power. Remember that this is a displacement hull, and the usual planing rules do not apply.