I start out really strong like 3-0 and finish game like 5/9. He falls off and I can't figure out how to use him since the re work properly. Is anyone else having this issue?

To clarify I use both builds depending on team comp. Q bruiser or AP Tank. If we're lacking tanks i'll go tank build and if they don't have any or just 1 tank I'll go bruiser. I start great and control the map so the other jungler doesn't get any ganks or objectives. I farm hard, hit lanes, hit objectives. I'm usually up like 2 levels on the enemy jg but mid - late game they're up on me by 2 levels. What should I be focusing on mid-late game?

I've played 20 games and am 8-12. I used to have almost 70% win rate when I played him pre re-work. I'm thinking it's time to drop him this season.