I can never get my cartos to work the same when I refill them. I'v tried 6 drops, 8 drops, all the way up to 16 and no matter what they always either leak, have a burnt taste or hit like it wasn't even filled. When I fill em up I remove the top rubber cap and drip the liquid in around the sides with the carto tilted and I rotate it every drop. Then I let them sit over night. Any help is appreciated. Thank you guys!