THX for the extra information. I suspect most of the lipos are coming out of the same factory, or at least whatever the raw materials or intermediate products that go into the manufacturing.
There are LHV cells, 3.85 volts nominal. I avoid them just because I don't want to have to wonder which I have, and to reduce charging mistakes. They don't really give that much more for the trouble, at least not to someone as conservative as I. Am.
There are (or were, was it a fad? haven't paid attention my batteries have lasted so long) "graphene" based cells, I assume/wonder if these are the carbon tubes you speak of. Again, from my perspective it just looks like paying more for a battery on some promise of something I don't need.
I've topped out by choice at <= 3s batts, <= 1500 mAH. So I don't spend too much, fly a bit less dangerously and sleep better than some I know with truly scary batts. Still plenty of all kindsa excitement.
I am amazed at what lipos can do, both the good stuff and the bad. 
a7