The amount of heat that is produced is entirely dependent on the quantity of fuel consumed. This is an undeniable fact no matter what the fuel is. All bubble stoves incorporate vapourising burners which are designed to draw as much air as is needed for efficient combustion. The more fuel fed into the burner, the more heat is generated in the flue and it draws faster increasing combustion air supply through the holes in the combustion pot. To reduce the heat, reduce the fuel flow, but if you go too low, then insufficient heat is produced to sustain combustion.
The combustion air restrictor on your corner bubble will be wide open normally, and will counteract gravity when an external influence (excess chimney draught from wind) cause a greater airflow through the burner which can lift the flame and extinguish it.
There is a minimum level at which the stove will operate, and at 4cc/min fuel flow this will be around 2 -2.5 Kw. As this is heating up a mass of metal, over a moderate period of time, if the area is well insulated and draughtproofed, in a small boat, this can become oppressive. The answer is to let in more ventilation to dissipate heat, or turn the fire off.
If you want to confirm the position of the combustion air restrictor, then the manufacturer is the best source of information, but as a professional technician with this type of equipment, trust me.