Re: How do i keep my shisha from burning and keep the flavor longer?
Well, you need not to use too much coals but it doesn't seem like you are at all. You should leave some air in the shisha when you pack it and not pack too tight.
Most importantly, leave some space between the shisha and the foil, around 1/8 of an inch, or just enough that the foil won't come in direct contact with the shisha once you put the coals on. Use strong foil that holds tight so the coals weight won't make the foil sink down and touch the shisha.
Getting a Phunnel/vortex bowel and the glass screen fron MN Hookah can help to make the flavor last longer, but only if you have the money.