Quite often the bite on the tongue is caused by the sugar that is in the blend, it burns hot and is quite often responsible for dehydrating the tongue. Even high grade flavored tobacco can be like that, it may start out with lots of flaavor and seem mild, but it will eventually bite you in the tongue. Oddly enough good old Prince Albert if not over stoked is easy on the palate. If you don't want your tongue to light up,stay away from flavored Virginia tobacco blends. As an example, never mix Amphora with RC cola.