[Gameplay] Precipitous drop in KDA since last patch

I would like to see if anyone else is dealing with this. Since at least the last patch, my KDA has dropped significantly. Gameplay experience acts like my stats are less than normal (something like 80% or even less). I don't know which is the best way to show what is going on, but I've gathered stats from na.op.gg and created a graph and one can see the drop with trendlines: https://i.imgsafe.org/4510d5f269.jpg. It goes from most recent games in hours from when the data was captured on the left to games longer ago on the right.

This graph shows a big drop about 2 days ago in kills when viewing the trendlines. Previous death levels have been similarly low about a month ago, but the kill rate was still much higher (I had a rash of bad games then). But also, due to the polynomial formula being used, the ends of the graph have to be disregarded since it is using null data points for the trend calculation. I am not sure what the minimum number of points needed to do a 10 degree polynomial, but I think it would be 10 or 11 points. So don't count the first 10 or the last 10 points.

The following issues seem significant lately:

1. I've had several games now were even with champs I normally get kills with, I have very few to none.

2. My mana pool drains much more quickly than before. I usually never run out of mana after mid-game and certainly late game. But now I do unless I have a tear or multiple mana items even for non-mage champs.

3. My champs, no matter how I build, die faster in fights. They also have a much more difficult time killing minions. I've actually died to minions twice since this change and almost died to them several other times. My adcs with a vampiric sceptre can't even life-steal off of minions enough to fight them. I have to back off if I am too low of hp.

I am a long time ARAM player and have thousands of games under my belt. So this mode isn't new to me. The only champs I can even do anything with are poke mages that I can buy tons of mana items and poke with spells. I still have lower KDAs with them than before. I can't even auto-attack much anymore if enemies are near me because I die so fast. Even my tanks get nuked early game before enemy champs have very many stats.

So, please pipe up if you've experienced this. It seems like I've seen other people deal with this, but they may not have the experience to notice that it may not be solely their fault. I've seen several other people have real trouble in ARAM games, but everyone just calls them a noob and think that they are just bad. I don't believe that is always the case due to the fact that I am dealing with a challening experience that last few days. Many of them appear to be playing mechanically sound and not doing bad decisions; they just seem to be dealing with issues of another sort like I am. However, it is really hard to tell while I am dealing with this issue at the same time during play.