Okay...here is the post that helped me get my squonking down. Hope it helps!
"If you are using a 510, squeeze lightly until you just begin to see a glimmer of juice in the holes of the overflow well. When you release, it will disappear. Short unpowered hit to make sure the juice is over the coils, and you are good for 5-8 nice vapes.
For a 306, the "blind squonking" method works best. Squeeze the bottle lightly and suck on the drip tip until you feel a small amount of resistance or hear a light gurgle. Short unpowered hit. If you have a clear drip tip, you should just see a sheen of liquid on the top of the atty. (If it is half-way up the bridge/mesh or more, it's flooded...blow it out). Also now good for 5-8 nice vapes."