Benchy gaps during layer change (Pictures Included)

[technobabble_]

Hello,

I have a problem where gaps are left where a particular shell starts and ends. When I looked under a microscope, it appears the filament turns into the part. I'm using a Monoprice (Flashforge) Creator X with S3D. I've tried:

retraction (high and low)
wipe (high and low)
coast (high and low)
temperature changes in 2c increments

Any thoughts? I've been working on the issue for weeks.

S20170316_001.jpg
S20170316_005.jpg
benchy-surface-dimples.jpg

S3D settings:

Material: Inland ABS, black
Extruder temp: 245c
bed temp: 110c
extrusion multiplier: 96
infil: 12%
3:3:3 top: bottom: perimeter
50% overlap
retraction: 0.40 mm
wipe enabled: 0.60 mm
cooling fan: on after layer 3