That's almost too funny. That thing carries more payload than any actual bomber that the Japanese had. The only thing that carries more, four 250kg bombs to be precise, is the H8K2 flying boat.
I wonder why the Japanese speced out such poor bombloads for their bombers? The Ki-67, for example, obviously has the raw power, lift and structure to carry a much heavier load. Probably as much as 6,000-8,000lbs. Yet the specs only asked for 800kg, and that's what Mitsubishi delivered.
EDIT:
The only ifo I could find was this:
The Shiden (Violet Leightning), codenamed 'George', started as a landbased derivative of the N1K1 Kyofu (Mighty Wind), codenamed 'Rex'. The Shiden had the floats replaced with a landing gear with tailwheel, and the Mitsubishi Kasei was replaced with the Nakajima Homare. Trials proved it to perform well. 3 subvariants were derived from the base version
N1K1-Ja Shiden Same as the N1K1-J Shiden, but with it's machineguns removed
N1K1-Jb Shiden All four of the cannons moved to the wing leading edges, and each hardpoint was hardened to carry a 551 lb (250 kg) bomb
N1K1-Jc Shiden Underwing provisions to carry 4 × 551 lb (250 kg) bombs
Number built: 998
No mention of how many of each subtype were built.
The site I got that from also states that there was an N1K2-Ja subtype that could carry four 250kg bombs. I think it would be best to get an N1K1-Jc though. That would give the earlier version a practical purpose in the MA and a real advantage to it in the CT.