ACRE is currently not working accurately until around game 15 or so. Many people including myself were getting extreme ACRE's around 2500-2700 despite having Glicko rating around 2150 or so.
For example I had an ACRE of 2640 with Glicko 2240+-106 or something. This makes absolutely no sense given the defintion of aCRE. However at some point the system corrected itself and my ACRE dropped by like 400 points to a reasonable value.
I strongly suggest going to 2100++-65. I am not good at all and was able to get 2100 without really trying.