Cone 10 is the goal. I can add blowers to the burners, but I have no idea what type of air flow is needed in the blowers.
You need about 10 cubic feet of air at STP for every 1,000 BTUs of fuel being burned for the ability to have complete (Stoichiometric) combustion. If you want to have oxidation conditions in the kiln....... then you add that percentagfe of extra air capacity (ie 10% oxidation = extra 1 cubic foot of air).
The best quality high pressure venturi burners (not the ones you pictured ) will only, at max setting, entrain about 65-70% primary air (mechanical linkage). So they will only pull 7 of those 10 needed cubic feet due to the gas exiting the orifice "bumping into" the air molecules in the mixing tube, and causing the flow of air into the burner thru the primary air ports. Which means that you are at a level of 30% reduction conditions unless there is sufficient secondary air present. That also means that you are potentially only getting 700 BTUs of energy out of every 1000 that you put out of the burner.
That secondary air to finish off the combustion reactions is coming from draft induced by the kiln system. Hence the need for the "stack" to help with this. And the correct size burner ports. And getting good mixing oof the secondary into the already burning gases coming out of the burners. This is also why "power burners", which are not dependent on draft to pull in secondary air, tend to make kilns far less touchy to fire and easier to design.
Note that blowers are rated in various static pressure readings as well as "free air". The free air reading means that is what the blower puts out in CFM with no resistance to the flow. When you hook a blower onto a pipe... you induce static pressure .... resistance to the flow of material. This decreases the output of the blower. Too complicated to go into here.... but just size the blower a bit larger than what you calculate you NEED.