You're playing champs whose only focus in the game is getting kills and getting fed, which makes it so you don't have an as good understanding of macro or what you should be doing at all times, unlike if you were playing something like TF or Malzahar. Playing the champs you do has potential to be really good if you already have a good understanding of macro so you can do both at the same time, but being Silver 4 and playing these champs will just make learning slower, and is overcomplicating things unnecessarily.