Re: holes in the foil
its really more so the amount of ventilation in the bowl. as long as you dont have a lot of coal pieces falling through its fine.
when my friends runs out of toothpicks he just uses a knife and uses less holes.
infact depending on the shisha i change the size of my holes, with starbuzz my mod bowl smokes on the light side with 2 coals but 3 is way to much but if i use smaller holes and a few less it smokes better because it retains heat, if i have something that 3 coals is better on but is a touch harsh larger holes balance it out