it sounds like they are pretty airy. i personally do prefer an airy draw, but if you don't like it, 3 holes on a nimbus clone is probably way too much.
also, i think you may not be running enough power for a very airy draw. you said you're running a 1.8 ohm coil at 6 volts, which should be about 20 watts, but unless you have a dna20, you're not going to get 20 watts out of a vv/vw
mod. depending on the
mod, you're probably somewhere closer to 12-13 watts. at this power, the airy draw will hurt more than help. typically you need an airy draw at around 30 watts or more to keep the vapor from burning your throat, but at the power that a vv/vw can fire, you'll just be keeping the coil cool instead.