ok. maybe this is the burnt taste people speak of, but I describe it as an acrid, very harsh taste every few drags. I have tried different fillers and ultimately am using the blue foam. Now, I have the riva. the foam in the cart is wicking because the exposed end is wet. when I get this taste, I am still getting thick vapor, it just tastes bad. If I let it sit a bit it goes away but then comes back. Since there is still thick vapor I wouldn't think the atty is dry, so what could be the problem?