I tried the Vivi's, not my thing at all!
Best bang for buck, try some other carto's for your tanks, 1.7-2.0 Ohm, nothing lower than 1.7 though! Ikenvape has some good ones that are getting great reviews and is supposed to be getting more in soon.
Next bet is to get another extension and a Kick, if you like the Bolt. This allows you to use the batteries you have, and limits the cost considerably.
Then you get into the Vamo and Lava tubes, I've got an LT clone, I'm not impressed at all! It's cheap JUNK! Sorry, but it is! I paid $40 for it, it got me into VV, I could have spent the money better, but I've got a back up at least. But it worked, and still does for now.
The Zmax and Vmax would be the next step for what you are after, but you are looking at a new battery set up on one of them, I can't remember now which runs on what, but one ONLY runs on 18350's (two of them) and the other can run on 18650's. Just keep that in mind.
Next is the EvIc that has yet to be reviewed, it looks cool, does all kinds of stuff, that you probably don't really need it to do, and I'm a little leary of the durability of it. In fact I was VERY interested in it until I found out it shuts down at 95f, that wont work in KS!
Then there is the others, Buzz Pro, Infinity etc, VV, but no screen, some issues with build quality on some units, but most have been happy.
I went ahead and bit the bullet and ordered a Provari mini. I looked at them all, got annoyed buy the fan boys, didn't like the price, but at the end of the day, I think (I hope) it's the right product for me. I like the durability, the flexibility (interchangeable battery sizes) and the fact it will maintain voltage throughout the battery life. Is it worth $200? I can't say yet, I'm waiting on it to show up, I hope so!
Sure, you could look at the EGO's, but I think you are way past that stage, and I'm to the point I don't want a "disposable" unit, which it really is.
I really can't advise you any more than that, just give you some options, of which I've missed plenty of, including the SB with a Kick! But it really comes down to you! $200 was a HUGE purchase to me, but I am extremely hard on things! This will get dropped, roll down the driveway, be around welders and who knows what else! That was MY justification for working my .... off and scraping the money together for it.