The new 'comeback" system is broken.

I just completely shut down a Yi as Graves. He was 1/4 within the first 6 minutes. I was 4/0 and I had taken 3 of his first 4 red buffs, and 2 of his first 3 blue buffs. I completely shut this jungler down. When lanes broke I was 8/0/5. We had an inhib and were going for the top tower inhib when a lux landed a snare on an Ashe and I. Yi came in and cleaned up for a double kill. He received 1600 gold from 2 kills. With this he finished his second item. I was 3 items and tier 2 books at this point (tabi). He found me and with 3/4 health solod me when I was full hp. Proceeded to carry the whole game to the end. My Sion top lane was 6/0 and died which gave 750 gold to Yi. This new system is completely broken. Why as the obvious better jungler am I being punished because I am not on a hyper carry and got a fortunate double kill? Players as high as challenger are complaining about this new system and yet I nothing seems to have been done to dial it back. My game play has been ruined by this new system and I have lost interest in this game. Hopefully, a hit in player base will lead to better decisions by RIOT in the future.

Thanks