Without getting into rebuilding if you are not that inclined to go into the trouble of it, pretty simple procedure, but does require some tools and supplies, these are my suggestions given my experience, note I use mainly T3 tanks as my out and about setups, I own about a dozen T3 tanks, equal number of standard T3 bases, and a dozen T3S heads and bases, the standard T3 bases are now backups to the T3S heads. I also own an original ProTank, ProTank 2, six Evods, and an iSmoka BCC Mega, and use my T3's the most.
1) Take a pin or toothpick and fluff up (fray) the exposed wicks on the heads. This covers the up the any possible air gaps to reduce overflooding the coil cup, with the side benefit of making the wicks soak up better.
2) Basic maintenance. Rinsing in warm, running tap water every refill or every other refill, let air dry. Weekly a soak in pure grain alcohol (pga) ie everclear or vodka, after dry burn, rinse in warm running tap water, let air dry. This removes gunk in the wicks, the dry burn removes gunk and carbon off the coil, allowing the head to perform optimally.
3) Ambient temperature greatly affects the T3 more than other BCC designs, but all BCC have this flaw, as the physics of viscocity, pressure, and vacuum the bottom coil design relies on change dynamically with temperature shifts. Equalizing these changes is a simple quarter to half turn on the base from the tank, just enough to let some air in but not enough to let liquid leak, then tighten up again
4) When you do get flooding/gurgling, remove the head, blow out from the connector side on the head, wipe off, then blow the tank air tube out from bottom, reassemble, maybe top off the tank in the process, are the only ways I've found that fix this until the tank is low on a stock coil.
Now, as mentioned above by other members, the ProTank 1 doesn't have this flaw as often as the T3, but it is there, the ProTank 2, something in its new design it isn't affected I have seen, I have read the ProTank 1 Mini isn't affected as much like the ProTank 1, but they are shifting to a new mini like the ProTank 2, so mini 1's will be hard to find, Evods I have yet to have any of mine show this flaw, metal sheathing over the plastic tank might act as a temperature insulator, and the Evod head design might might have fixed this flaw. The iSmoka and VapeOnly BCC tanks don't get affected as much either, haven't tried a Vision Victory yet, but that may also be an option. If you are willing to learn to rebuild your T3's you can fix some of the flaws with the type of wick you put into the coil heads, takes some research and practice, but really they are not that hard to rebuild, the standard T3 head a little harder to work with compared to the T3S/Evod/Protank/iSmoka/VapeOnly heads due to the cup of the Ego connection when you trim the coil legs and reassembly stage of the rebuild. Not wanting to go that avenue due to the extra tools and supplies, then look into one of the other BCC systems out there or move to a top coil design.
My suggestions if you wish to move from the T3
Wait for the ProTank Mini 2 to come out
Look at the Davide (Protank 1 clone) but can be disassembled and use your own mouth tip, basically a fusion of the PT1 and PT2
Look at the Protank 2
Look at the Evod
Look at the iSmoka/VapeOnly BCC (1.6 mil) and BCC Mega (3 to 3.5 mil)
Look at the Vision Victory
don't want to get in to all that other crazy much more complicated stuff just simple clearo and ego c twist and good juices to keep me off the cigs and my wife happy I'm not smoking also saving money (also cause I'm a broke ...) but yeah. oh and another tip for the T3 might sound crazy but if your having lots of issues with the gargling and flooding regardless of juice level even on a full tank take apart the head and if you have and old or extra head take that apart and ad a wick (yes I said ad not take away) could just be too much of a gap if it stops the gargling but then its burnt maybe try like to fray the wick a lil and only put a few pieces in there that's all I got its all about experimenting. and some replacement coils for them T3's are much dif. so you may get another and it works perfectly fine who knows but if you don't mind the lesser amount of juice evod's are awesome no issues since I got it actually a little but I just removed like half a wick and working like a champ vape on brother and I feel your pain on the simple hassle free 
