No, definitely not.
Not long term at least.
I used to play a lot of EZ but now I stopped and ar8 definitely feels fast even after 2~3 days. I didn't even try ar9.
That and the fact that cs4 feels like cs7 which is probably what's the most frustrating, the misses and all that,it feels like i'm always on the edge. You'll probably get a little confused but that also depends on how much time you spent on ez, but only for a short time.
Don't worry Tensku, your high ar reading is safe.