Hi everyone, I've seen that a lot of people were asking about increasing the number of stacks on the LS, so I checked a bit the files of the addon and found where it is possible to change that, so there it is:
1) Go into World of warcraft/Inteface/AddOns/Elementarist/modules
2) Open "elemental.lua" with a text editor (your favorite one for example).
3) Go on to the line 200 and check those lines:
elementarist elemental.lua
the Earth shock will trigger in the priority list if :
Lightning shield has 12 charges (first line).
or
Lightning shield has 10 or more charges but FS expiration within 2 secs to FS CD (second line).
Now just adapt the values, like 16 or 17 for the first line (cause Multistrike can make you having 19/20 stacks really fast), and something like 14/15 for the second line, I honestly haven't find what are the best values at the moment for the addon to be the most efficient but it's up to you to try and make tests.
4) Save and close "elemental.lua", then launch the game
It actually worked for me, it seems to have some problem when you put too big values (ES will not trigger on the priority list) but as i said just try some differents couple of values, and wait for the last release of the addon, it's just some little changes so we can actually use it while waiting.