Metal with a tiny bit synth

Come on guys, what the hell ?...

I love that guitar sound, i'm quite new to all of this so i'm afraid i can't really point to you what's wrong but i think the snare isn't shining at some moments ;)

I have a question though, even if we don't have keyboards in my band there is this one chorus in a song where there is. Just a tiny bit, like yours ! I've searched and i can't find any tips on how to get a fairly correct sound or at least not do anything wrong.
I'm not looking for a go-to chain, but like, how should i pan them ? (there's 2 synth with one guitar at the back playing the same melody as one of the synths) What freq isn't used by keyboards ? etc.