Hey man, first of all a chest route is definitely important. I'm not just talking about one with alot of tier two's either, you want one which not many people use with at least 3 tier two's. Secondly once your chest route is complete don't just run straight back to the middle hunting around, if you really want to win remember that the longer you stay away from other people the less people you will have to fight to win.
Although practicing PVP is helpful, to be honest I believe you are a good enough pvp'er to win games and that is not the main problem.. my personal opinion is that strats and gameplay wins over PVP skill any day. I'm planning on making a few video's on how to win games in MCSG but if you would like to chat then just tell me, I have some good tips which I don't really feel like sharing to the whole community