Can't speak as an expert as I'm still on my first model (KR808D-1; 2-piecer that uses cartomizers), but I've noticed that throat hit on those does seem to be tied to mg's, at least for the pre-filled cartomizers.
Original kit came with 16mg which hit pretty well, but gave me headaches, so ordered some 11 mg's--work great, but seem to have a little less hit. That order came with some sample 0 mg's which I find to have almost no hit--like a super-ultra-light analog, if one existed. There's tons of vapor, so it's not like it's not producing anything...even direct lung inhaling (not filling the mouth, then inhaling) doesn't produce much throat hit.
I'd like to see other posters' opinions, plus I think I've read somewhere here that PG and VG-based juice give different throat feel. Sorry Ican't be more exact, but I've spent waaaaay too much time here to remember where I saw that...