3 ohm cartomizers will perform best between 3.5 - 5.0 volts (you figure the wattage). Cartomizers can either be relatively silent or have a characteristic sound during the draw or puff. Heavy gurgling sound indicates the carto is beginning to flood (too much juice in the carto).
Flooding can be caused by several things, most of them being user error. First of all, examine your vaping technique. Too strong of a puff or draw can lead to too much juice into the carto. If you are doing this, change your technique: Slower, gentler, more deliberate draws of 3 - 6 seconds in length.
Too many holes in the carto with a thinner juice can cause flooding. 50/50 pg/vg ratio a single hole works best. Thicker or more vg juices may require the two hole carts.
I have a cartotank tutorial in my blog. You can access those articles by clicking on the link below my avatar.