I used to think it was hard to adjust too. But I found that if I use my thumb without pushing in at the same time it moves very easily. Figured that out day one and been moving it that way ever since, so it never occurred to me to say anything.
I also don't adjust it very often. Just once per build. I love how it doesn't move around on its own.
Uhhhh, what? In series it's 7.4 volts with fully charged batteries compared to 3.7 volts in parallel. Did you mean too hot in series?