Best tube dampers that you have used


I currently have a Thor Audio monoblocks TP-150, 8  EL-34's Sovtek tubes for each amp.
Was wondering in anyone's experience will tube dampers improve the sound quality.
Am hesitant to proceed as I have read that  tube dampers can melt from the heat of the tubes and sometimes
cause smoke. Any thoughts would be appreciated.  
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Have I forgotten anybody? Oh, no!  I forgot the 1/8” Marigo VTS Dot Tube damper that gets stuck on the bottom of the glass tube in the center where all the tube pins come out of the glass.
I stopped using those sorbothane tube dampers because they got gooey with tube heat over time. Total mess! 
I once made the mistake of using hemorrhoid cushions for tube dampers.