should my charm be always lvl 55 or it can be lower?or higher lvl of charm is always better?or its only about ee?

Iam new in LS:)

With equal EE, level 55 charms would do more damage. You should read this, it will explain it a lot better: http://forums.d2jsp.org/index.php?showtopic=25037040&f=272

Tyvm for help.

one more question.how it is if two charms (the same kind-for example fire) got the same tier and the same ee-do they always have exacly the same dmg or it might be different?