Most of my tongue bite problems disappeared when I stopped smoking aromatic cavendish blends. I have been smoking VaPers, English, crossovers etc with little bite. Some oddball blends have bit me hard for reasons I cannot fathom: P&C's Union Leader match for example. But I did find that blending in a generous pinch of turkish blending tobacco made that issue go away. It does seem to be a pH issue. So some combination of additive blending and maybe drinking a soda, ice tea or other acidic beverage can spare the tongue.

Worst burner of all was Velvet, which I gradually over time used pinches of in various batches of homemade english/balkan blends was a way to use it up without searing my tongue.