One thing I observed with my homegrown: I found despite not fertilizing for a month before picking, the one year I used spray fertilizer was the worst for tongue bite with the Virginia and Hungarian tobacco. There was also horse manure in that bed. The Turkish, Maryland, burley and dark tobacco grown elsewhere with the same spray fertilizer but no horse manure had zero bite. Hard to compare strains and make a conclusion from it though. But maybe it was the horse manure? Maybe it was the spray, somehow? Maybe it was overfertilized? Is the red Virginia grade more common in overfertilized fields?
My point is '?', and to be specific, '?'