Re: Another Vortex thread
Check to make sure the holes are actually open, sometimes the clay doesnt get knocked out before its fired, or the glaze drips and seals them up.
Past that, you might be overpacking, restricting the airflow through the shisha will only compound the problem if you've got a tight draw.
Third option would be to wet sand the holes by hand using 2000 or 4000 grit sandpaper. Careful doing this, you could crack the spire.