hi Helmar, thanks for your feedback! Let's try get this solved asap.
Even with the tanklid closed the puromizer should not taste burned. This is not a design flaw, we've gone through many design versions before we released the puromizer for the market. Vaping with the tanklid curved is a tuning preference for some.
I can only think of one reason why you experience burned taste and this is something we've tested: The liquid cannot reach the coil in time before you inhale when you puff at a fast rate or when you puff short puffs at a fast rate.. Try inhaling slowly and leave enough time in between puffs. Remove the mouthpiece and drop 2 drops of liquid from the top.
A question, does it taste burned in the morning when you take your first puffs?
Keep in mind that although this is quite a difficult mechanical design, the parts of the puromizer are still assembled by hand. Therefore the wicking can be too tight for some (could be the cause of burned taste) or the wicking is too loose (could be the cause of leaking).
In any case, if you keep experiencing this even when you change the puff rate, method or rythm, open a ticket and ask for replacement.