Everything you're describing is attributed to the net code and snapshotting. Nobody is particularly fond of the former, but it is something you have to adjust to or just don't play. This isn't a bid to "git gud", it's a bid to help you realize it's stuff that's hardwired into the game and likely won't change.

Don't expect to knock someone back exactly where you want them unless a cc is involved. Just because you're first on your screen does not mean you're first on the server. You have to be proactive on a lot of things and also recognize that someone who owns a corner has a huge peaking advantage over someone who is in the open, all because of the net code.