My instances of mouth burn (I guess that includes tongue bite) have been with aromatics. I can smoke big sturdy full strength blends of burley and/or Virginia, rope and plug, etc. It's just just the flavoring that gets me. I have some good aromatics that I enjoy, that I think of as tobacco forward, Sir Walter Raleigh Aromatic for one example of about a dozen, and I do fine with these. One holiday blend with cinnamon and such was like chemical warfare on my mouth. So nearly all non-aros work for me, and aromatics selectively. I think everyone has to work this out for themselves and their own body chemistry.