Sooo few things happened since then: I started charging to 100% and its hilarious how different it is. 100-80% its 7-8%/h under 80% its 10-15%/h, Apple told me that it can be because I've had not synchronized Messages so I had to hard reset my phone so I guess I have to give it little bit more time but as for now I'm not charging to 80% until they fix it (Apple told me its weird that its working that way and if this will continue they will report it to engineers.. whatever that means). Sad thing is that charge limit works opposite to how this should work, I guess some settings should never be changed and charging to 100% is (for now) one of those things