Where did you get them? What part of the tank are they leaking form? From the bottom of the coil that touches the battery, or the top of the coil that twists to the tank?
I've been using T3's since I started vaping and used to get a lot of gurgling, but added a little trick to filling them, now I never get any gurgling and they work great.
First, i prefer low ohm coils for my ego twist.
Second, I got the most gurgling just after filling them. I realized this because when I had the tank upside down, no matter how careful I was to avoid getting juice down the center shaft, I always got gurgling.
How I fixed it was, before removing the bottom coil, take a piece of a paper towel and twist it up really thin so you stick it through the drip tip opening. If you look into the drip tip you will see a small hole (this leads to the center shaft), make sure you're paper towel is thin enough to get in there. In addition, part of the paper towel should be filling the drip tip itself. Basically what you are doing is completely plugging up the drip tip. Then turn it over, remove the bottom coil and fill with juice. Fill it as high as you want, twist on the bottom coil nice and tight. Then remove the paper towel you used to plug up the drip tip.
If your T3's are anything like mine, you will see a lot of juice on the paper towel. Then twist up another piece of paper towel and stick it back in the drip tip hole to get any other left over juice. Continue doing that until paper towels come out dry. When i first started doing this it required 3 or 4 paper towel twists, but after doing this a few times, I only have to do it once and the T3 works flawlessly.
Hope that helps.