I have a few devices... and while the non-adjustable ones are controlled at 4V my adjustable device at the same voltage gives a completely different hit/taste than the others. I am wondering if this is simply the voltage regulater/pulse modulator causing this or if it may have something to do with various material tolerances and connector metalurgy causing slight variance in ohmage. I have noticed this between both DCT, top coil tanks, double barrel tanks, and even regular carts....