my HH.357's are very hash to vape with now, i did the propoer cleaning , and still the same, running a 1.5 at 3.3v on ProVari and still harsh. it was good when it lasted
Try soaking it for a bit in unflavored PG. Use an ultrasonic cleaner if you have one. Blow out the excess PG then add your juice and see how it works then.