To start sorry if this is not the correct section or sub section.... Here lately ever juice I make is quite harsh... Not throat hit but harsh kinda like sand paper to the back of the throat... I have been vaping on mutation x v 4 duel 26g 9 wrap 2.5mm @.44ohm Japanese cotton..bottom air flow blocked 18° wide open lung hits on an I stick 100 @ 50 w... Juice has varyed in an attempt to resolve... Originally it was 6mg vg nic with no pg added just flavor @ 20%... Since then I've dropped it down to 3mg then to 0mg nic and 10% flavor... Using bcv VG, heartland nic, tfa flavor... I've picked up some MTS vape wizard yet still persist... Went to the doc to check on the possibility of health factors none ... Current recipe is key lime 3% graham cracker crust 2% milk/dairy 5% all tfa... Secondary recipe is 5% vanilla bean ice cream 3% strawberry and 2% milk/dairy... Also on 10% fw cookies and cream... Thank you kindly for your time.. To be honest this sounds like an "environmental" issue like I'm getting sick or something but is there anything else I can try to smooth it out some