It seems obvious, that the hard blow splashes up the otherwise calm water and increases the contact surface thousandfold!
To copy this under calm conditions, let the hot gas (entering the condens tank) blow through a soft bending and floating tube, ending under a raft of burlap
(temporarily, by gas, floating).
At high blow, the burlap raft will flap like a flag in the wind, and at slow-blow the gas is forced to travel under the burlap, steaming well...
A flat raft to avoid plugging, that a bag would do!