Without visuals... very hard to say.
With those two burners, if they were operating correctly and the damper was adjusted correcly and the air balance was set right, you SHOULD be able to get that small kiln chamber completely full of products of combustion and actually have the flame-front burning off in the base of the chimney (reduction conditions). In that case the chamber would apperar "hazy" and while you could see some quality of flame within the chamber... that might look like silk gauze rolling in a breeze...... you wouldn't typically see a separate flame and totally clear atmosphere elsewhere.
Have you ever been involved in reduction gas firing elsewhere? If so... how does what you are seeing compare?
Video clips would help.
WIsh I could be there......... sorry.