No, I haven't tried this particular coffee flavor in a regular tank. I need to. I do have SauceLA's Caramel Waffle Cappucino and I agree it is good. I like the idea of getting seperate cartridges for the Penguin, so you could easily change flavors. Just waiting for a couple of my favorite vendors to get both the coils and cartridges in stock at the same time!Have you tried your coffee eliquid in a regular tank? I found some coffee eliquids do taste burnt and or bitter. Hubby likes grape eliquid so I have Verde Valley Vapes Grape Geeks in the Penguin and no burnt flavor.
Maybe try a fruit flavor? A good sweet coffee is SauceLA Carmel Waffle Cappuccino and Vanilla Bean Cream, I also like Om Vapors Cafe #7
Yes there is no wattage control on the Penguin either- but the grape eliquid tastes pretty good in the Penguin.