Been a while since I posted. Finally put down my DSE 901 (3+ years on the original 4 attys and original batts) and got a Riva 510. I use carts, they are full, but I'm getting a burnt taste most of the time. Dripping directly onto the atty seems to only help a little. Anyone else have this problem? COuld it be the atty gets too hot as to override the taste?