My advice on the shard chat is just don't worry about it for now. I get top 20 in my fleet arena on my alt account frequently and never have an issue. Trust me, if you step on toes (or if someone hits you on your climb) then a quick message can usually resolve the issue. But there likely isn't a need if you aren't even having issues. Try and get 1st by having a good enough team 1st.
Usually the "hate messages" are nothing more than someone a bit angry because they got sniped. From my experience if you respond with some tact, most people will invite you in or at least agree to not hit you if you don't hit them. Most people that have issues with shard chats, have those issues because they don't play well with others.
