Re: vortex bowl users....
It seems you already have head it, but I would switch to natural coals, not just because they go for longer and are all around better, but because the coconarahs I have are a nice size so that I can fit three of them on the vortex, which i think heats all of the shisha more evenly. That might be the problem, unless you got just the top layer of the shisha, in which case you just need to re-coal. When I used quick lights I usually re-coaled at least once during the smoke sesh.
Basically: re-coal and the smoke will come back, quick light's don't last long enough for one coal.