I have several standard T3's. What you are getting is a little vacuum pulling more liquid in than necessary, but the biggest part is from condensation, have to remember how far the vapor is being pulled up, so it cools a bit. Unscrew the coil cap, blow through the bottom to clear that out. Tank assembly blow through the bottom, or what I do is run a pipe cleaner up through the tank tube after blowing it out. Thicker liquids could help as well, full pg, go with a 70pg/30vg mix, if already at 70/30, go with a 50/50, etc. Might also, if you haven't, rinse and clean the head, even soak in water or maybe vodka for a couple to clean the wicks, then as mentioned above for removing a wick or 2, remove the coil tube carefully, pull the loose wicks away, attach head to battery after drying it, then dry burn the coil until the coil turns red even over its surface in 2 second intervals to burn off carbon and such that is insulating the max heat of the coil. After that, put the wicks, tube and top seal back on, coil head ready for optimum burn again. I'm new to vaping as well, and have settled on the T3/MT3 for most my all day/out and about vaping, so looked up and studied some things on the mainenance of these early on. Got 5 T3's in regular rotation, with 6 coil/heads, was 7, before 1 reached it's end of life expectancy, original head came with my original T3, 1.5 months heavy use on that one coil/head. Always after about 3/4 to full day of vaping on a single head would get the condensation issue of gurgling on a head, mostly collected in the head/coil tube, or tank tube, so these are just pointers from my experience and hope they help