Not entirely unexpected,if you've spent your vaping time on much lower power devices then you will suffer after-effects.My present ADV is at approx 60 watts and I suffer from after-effects just increasing by approx 10 watts.My after-effects are instant though,coughing & ruined tasting juices.I could simply vape 100% VG though even that leaves a strange taste lingering in my mouth so I generally add a couple of drops of menthol to the VG.