rubbing alcohol is bad, very bad for your health, try blowing them out, run water though them blow them out again to make sure they are good and clean, if you have vodka or everclear you could try that as well. Also do not dry burn them that would also make them taste bad.
I haven't used those particular atomizers but you may not be getting enough
juice in them, try flooding them the first time after you get them clean, then just keep dripping when the flavor fades.
I know with 306 atomizers i have to basically run them flooded or near flooded all the time to perform like i want them too.
As for the one that has a hard draw, check the air holes around the bottom to make sure there is nothing in them, also some can be adjusted with the center pin and a small screw driver, but do not force it if it doesn't easily turn or you could ruin it completely.