...as has been said, TH is 'largely' a product of nicotine and less of flavoring, steeping, etc.
I think that hits the nail on the head. There are some flavors that "hit" harder and a higher ratio of PG vs. VG will give you more bite but I'm not sure that's TH in the sense we are meaning here.
I'm with those in the camp that think it's pretty normal for RY4 to have a "mellow" TH, but it's not like I've tried them all and I've dropped my nicotine level down to 12mg.
Norman