The US weights are without the rear fuselage tank filled up. Also, the US birds have 1200hp due to 100 octane fuel being used, which was not the case with the export models. Finnish and RAF Hawks used 87 octane, and French data is also with 87 octane, so I suspect this was representative for service. Export Hawks also were somewhat heavier than at least the P-36A, due to more guns and ammo and other equipment being added. You'll end up with a 6600lb plane and 1000hp power maximum, and performance, in particular climb, is going to suffer accordingly.
There's a 10 page chapter in the Osprey P-36 Aces of WW2 book on Mohawk service in Burma.
The P-36 was more stable the the P-40 because it had less surface area and arm in front of the CoG - the long nose did screw up the aerodynamics quite a bit. With the change to the H87 model this problem got so bad, they decided to lengthen the fuselage 20" in order to get back to sufficiently good lateral stability.
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