Like any other pipe, rim char is operator error. Leveling the chamber when lightning helps but isn't necessary.
Thank you. Leveling the chamber when lighting is not too hard I suppose, but sounds inconvenient to me. Interesting to hear it's not necessary. The remainder of the smoke I imagine the ashes-end (?) pointing straight out horizontal or down, and the heat going towards the top of the bowl. That's got to leave a mark...
I'm just not happy when the rim gets either charged/burned, or otherwise changes color due to the heat of the lit tobacco. That's not happening to you? Some are ok with that, but I've avoided forward cant bowls for that reason. Perhaps (I imagine) operator error is possibly more likely with this shape because it requires different technique. I get that. But that technique is hard for me to imagine.
Maybe I am wrong and should try one! I love the look of the shape and it seems it's working well for you. I'll reconsider one I have had my eyes on.