I smoke AF out of a phunnel all the time and never really have any harshness. My roommate doesn't smoke nearly as much as I do tends to complain a bit about the tickle he gets from AF. I think it's just something you have to get used to
Try mixing it with something you are comfortable with. I did some AF grape and Mizo mint tonight and it was the easiest smoke ever. I'm actually posting a video of my semi-big bubble that I blew out of it, so you'll know that I'm not just talking out of my ass
Good luck and keep smoking.