The gurgling seems to mean that there is too much liquid in the resistance. If you really don't want to replace this fantastic stuff, you can do this to address this problem. Or another case is that if it's the imperfection of your bought product, suggest you should get the premium on official authorized distributor website
I. Fire 2 or 3 times for a few seconds without vaping.
II. Put some towel near the airflow and blow through the drip tip.
III. Vape very hard a few times and this sounds weird but it helps sometimes you.
If you want to change the o-rings to see if that helps, i think that's not a good idea. Actually you never have to replace any o-rings in more than a year on your Nautilus. Also you can wait patiently to try the new coils Aspire which will bring out at the end of this month.