You have the cooling devices set up in parallel, so all you would be doing is increasing the volume of the burnt offerings, instead of increasing cooling efficiency.
To perhaps make it cooler, or at least more filtered, you should arrange the 3-holed, decorative flower vases in series with ice in each one.
Be prepared for a lung embolism from trying to achieve satisfactory vacuum and volume to be able to properly deny inhaling anything.
You might need to devise a high-pressure air/flame induction system to assist with the herbal holocaust.
LN2 might also help with cooling.