I tried a bunch of clones and they all sucked. I ended up buying an authentic. The reason they sucked was the -s removable base caused a ton of connectivity issues. The authentic, if you like the clone will blow you away fit and finish wise. Gt2 is one of the few clones I bought that never worked right and I went out and bought the authentic.
You can buy an authentic base and use clone parts for the rest, at least the hotcig Clones work well enough to pair with the authentic one.
I just build mine with an infinity coil last night. I've used infinity coils a ton in kayfun but due to the air hole design I didn't feel it would be ideal in the gt2. So I gapped it more across the middle to allow air to,flow better through the collection chamber. I was worried the extended joint wouldn't hold up and would heat through and break but with the cotton and liquid in there it's not an issue. The result is a super flavorful vape that takes a fair bit of power and chucks vapor.
For the underside of the cotton I ended up cutting it close to the bottom of each chimney coil and then pushing it back towards the center air hole.
Anyway I highly recommend this build 28 gauge, 8 wraps total around a 2.5mm post split into four (you just food the coil in half effectively making sure you go the right direction to have both leads on the bottom. I bunny ears the build on my taifun like I build the hurricane. It works a lot better to tuck the cotton down than to cut the cotton on the outside. You can close the top chimney cap all the way down. Just make sure the cotton "shoulders" are pressed up against the wicking holes, and wick tight. I use 90% vg juice and have no issues. It takes thirty watts with no issue, and is around a 1 ohm build. This build works wonderfully in the gs2 also
Also check out the steam tuners matte to clear tank option. It's durable and looks amazing. Don't get the clear tank from fasttech. I ordered a five pack and one fit standard drip tips, only 2/30 tips I tried. 4/5 didn't fit any drip tips I had.
Infinity build
Gt2 steam tuners tank