New member but long time lurker
The cork is good if you use the WPA so you don't have to touch the vape and risk breaking the glass by putting too much stress on the joint of the pipe. But when using the mouth piece remove the cork and you now have a lot of option to get the perfect hit every times. If you want to you can also feather the air intake of the bowl and you'll see that the heat raise a lot quicker but be careful about combustion. So many different way to use this vape, that's why I love it so much.