FlashForge Creator Pro 2 Benchy

[JagwireJ]

I just upgraded from a Malyan M150 to a FlashForge Creator Pro 2. PLA prints of the benchy work wonderfully, but I am new to ABS and need a little help. The first couple prints I ran showed shrinkage on the bottom 20 layers or so. I reduced the print bed temperature down to about 85 degrees, which appears to have solved that problem. The one problem I have not been able to resolve is curling on the front of the Benchy within that 20 layer or so area. I have tried both reducing and increasing hot end temperatures, printing a wall to reduce any possibility of draft (the printer is enclosed), and even tweaked some of the cooling settings to give each layer a propper time to cool between layers. Any ideas?

Layer Height: .18mm
Extruder Temp: 240
Platform: 85
Raft: Yes
Cooling Fans: Off