F4UDOA,
To the best of my knowledge the 22,221lb weight includes 2,000lbs of bombs as that is often listed as its maximum weight.
The Mossie VI's empty weight is 14,300lbs. 14,300 + 3,258 + 2,000 = 19,558. How much would the armament add?
What is the power loading of a laden F4U-1C?
The Mosquito FB.Mk VI Series 2 should have a power loading of 1hp per 6.8lbs while fully laden.