hi,, I gave up on my EXO RTA, and vaping for a bit. I need everything to be hassle free as possible with the tank in order to enjoy vaping. EXO holds a LOT of juice for a small'ish tank, and I doubt what I get next will hold as much juice for a small'ish size. But the EXO air flow ring was so stiff that it could never get it to close without tools or taking the tank off etc. If I removed the o-ring, it would be too loose. I guess I could have sourced out a slightly thinner o-ring and made it decent but I didn't get into all that. I've seen this problem on so many tanks, especially if they're wet from a little juice, the knurling/grip is useless. I don't have arthritis or anything either, the grip is use not grippy enough. So I'm looking for recommendations for basic (nothing fancy unless it's worth it, I haven't looked at tanks in a year or so and don't know if there's any new technologies worth it), want basic single coil or dual coil but prefer just single, must be plain unpainted stainless steel preferably 316L. Would like recommendations for one large/medium size tank to use on triple 18650 MOD, plus one smaller tank for single 18650 MOD, both must have juice flow and good grip/knurling on the air flow and juice flow! DTL big cloud type tank I want. I already have a coppervape skyline clone which was decent but that too, the juice flow gets jammed and there's a tiny o ring to remove that helps prevent that but it's been giving my DNA mods TEMP PROTECTION errors for some reason even though I swear it's not shorting out or anything ( could be the stainless kanthal clapton I just started using is 'popping' like crazy and might be bridging some sort of gap to cause error, IDK, this is what I'm talking about needing everything perfect and not wanting to smash everything. please recommend. thank you.