Apologies in advance, I haven't read through much of the thread, but is it generally known that you need to use a much lower voltage on these than you would on a carto of the same resistance? Even the 2.8ohm head needs low voltage for me, normally on a 2.8 or so carto I would run 4.5-5v, seems on this if I use more than 3.6-3.7v I get dry/burnt taste pretty quickly. Is this normal or do I need to fiddle with something, lol?