Firebreathing : longer flame time

I have been breathing for about a month or so and am fully aware of the risks and how bad it is but I'm fully happy doing it so before anyone goes through the be careful or 'you could die' speeches. Feel free not to bother. (no disrespect intended) I am producing some really nice 8-10 Footers at the moment but i am just trying to make the flame last longer. I have been trying to keep my mouth slightly tighter but i don't want to get the imfamous blowback. I cannot get any more paraffin in my mouth. So does anyone have any suggestions to make the flame linger slightly longer?

Thank you in anticipation.

Tennis

increase your lung capacity. it's the truest and best way. plus, try to use as little fuel in the stream in any moment as you can, in other words don't waste any, and use your tongue to push the fuel toward the lips hole in a constant, small flow.

Could someone please explain the tounge thing for me i'm still a little bit fuzzy?!? (could be the paraffin fumes)