Even though I'm at your 2000 elo mark with a 70% winrate? I doubt it. I'm not measuring KDA at all. I'm measuring your KILL PARTICIPATION, has nothing to do with your deaths. Anything under 60% with KARTHUS, you got carried, sorry to break it to you!!! You could at least farm better too with him, you know his Q does what double or triple damage to a single minion? I'll come at you more objectively.
In your 40 minute games, youre placing the same amount of wards in your 20minute and 30 minute games. SMDH LOL
The win streak is nice, but if you're getting carried, you're not boosting anyone for "free" you're getting the free boost.
Take it as flame, or take it as something to look at to improve idc.