I have had success printing ABS as of late printing at 255 degrees with the fan on (for overhangs)… Your bond to the build plate must be very strong though other wise it will warp off in no time. I also run a space heater in the room while it is printing. Makes the room about 35-40 Celsius or so. I printed some calibration cube and the dimensions were very close to perfect so shrinkage was not an issue.
If your hot end will allow you to print hotter print hotter. I read an article about this guy that was getting crappy ABS prints the cranked the heat and turned on the fan then it was printing beautifully. He had an all metal hot end so was printing at like 280.