Ive tryed the ceramic flavor disks..they work fine if your bowl is large enough alowing enough air flow around the disk ..[you cant blow through the disks..

But you may want to try forming a peice of a volcano wet pad  to fit into your pipe bowl..

They work great especialy when i use dmt tincher in them...

Photo below of volcano wet pad..its basicly corse steel whool formed to fit a volcano..but you can just tear off a peice and form it by hand to fit your pipe bowl...