I suffer from tongue bite a lot more in unfiltered pipes especially if its got a lot of red Virginia in the blend.
I recently opened one of my tins of Cornell & Diehl Red Virginia Flake (awesome tobacco by the way) and I did a side by side comparison.
I have a Peterson amber spigot that I purchased an extra 9mm stem for which I used for the experiment.
Same tobacco, same bowl, same dryness and same cadence. When I smoked it with the unfiltered stem it bit me like a bugger. Two days later I tried it with the 9mm stem and it didn't bite me at all.
This is just my experience but I know others have found 9mm carbon filters have helped them with tongue bite.
I'm not advising you to buy a new 9mm pipe as it might not work for you, I'm simply telling you what I found.
As people often say on here, YMMV.
I recently opened one of my tins of Cornell & Diehl Red Virginia Flake (awesome tobacco by the way) and I did a side by side comparison.
I have a Peterson amber spigot that I purchased an extra 9mm stem for which I used for the experiment.
Same tobacco, same bowl, same dryness and same cadence. When I smoked it with the unfiltered stem it bit me like a bugger. Two days later I tried it with the 9mm stem and it didn't bite me at all.
This is just my experience but I know others have found 9mm carbon filters have helped them with tongue bite.
I'm not advising you to buy a new 9mm pipe as it might not work for you, I'm simply telling you what I found.
As people often say on here, YMMV.