There are still quite a few tanks for cartos around. Fancy ones too. But for the best value, to me, I would recommend IBTanked. They are elegant simplicity at it's best. High quality, reasonably priced. They have never disappointed me or let me down. The owner of the company, OCD, has several threads on this Forum and is easily accessible. A big plus in my book!
Just about any carto will give you the tighter draw you want. But you may need to finesse it a bit as you go along eg size and number of holes or slots. Generally, Boges are tighter than Smok because the filler is denser. But reallly, don't stress over that now. Just get started. IBTanked only sells Smok and the bottom of the tube has a little skirt on it called a flange. I think those are great to get started with. Plus it's nice to order everything all from the same place in the beginning, cheaper shipping etc
No worries there, I have used up to 50/50 with no problems ever.
Oh how would you compare flavor between your carto and the GS air and any nautilus you tried?
I have never hated a tank/clearo as much as I hated the Nautilus. They have many fans though, so different strokes and all that. I have a few of the GSAirs. I like them just fine. But I don't like them nearly as much as the cartos. Of course, YMMV.
If you do try carto tanks, I would say the most important thing is to learn to prime them properly. With proper priming, using non coil gunking juices, a carto can last up to a month! If you order from IBTanked, you will get a nice guide to using the cartos and a "thingie" that is like a 35mm film canister that will help get them properly saturated. You should also get a "refilling tool" which is really a long drip tip. It is indispensable! It will save your O rings from getting chewed up and they of course, are what keeps your tank from leaking!
I vape simple clear juices and to me, next to a rebuildable like the Kayfun, I get the best flavor from a carto. But but but like everything else in vaping, taste is subjective!
The carto users on the forum tend to be the "old timers" or ahem,

the more experienced vapers! There's a reason for that! I hope you find the perfect vape for you. If you have any questions, you know where to find us! Good luck!
Sugar