I have no idea where you got those rates of fire, but they are wildly off.
The Hispano II has a 600rpm rate of fire
The Browning .50 has about a 750rpm rate of fire.
The Ho-5 numbers you posted look like Type 99 Model II numbers, as on the N1K2-J and A6M5b. The Ho-5s on the Ki-84 (and Ki-67) are the fastest firing 20mm cannons of WWII, having a rate of fire something like 750-850rpm. Try it in AH, it fires MUCH faster than the Hispano, To make it easy, take a Mosquito Mk VI with normal ammo load (150 rounds per gun) and see how long it takes to empty them compared to the Ki-84 and its 150 rounds per gun.
I don't know the Ho-103's rate of fire off hand, but in AH it will be 10% lower than uninterrupted. Apparently, in reality Browning and guns developed from the Browning, such as the Ho-103, suffered more like a 40% loss of rate of fire from interrupter gears.