Skenforge fill setting / support

hello guys! iam new to 3d printing. need some help.

1. skeinforge 50 - fill setting.
it is producing gap in print, top layer not as solid as gcode produce by slic3r.

Diaphragm Period (layers): 100
Diaphragm Thickness (layers): 0
Extra Shells on Alternating Solid Layer (layers): 1
Extra Shells on Base (layers): 1
Extra Shells on Sparse Layer (layers): 1
Grid Circle Separation over Perimeter Width (ratio): 0.2
Grid Extra Overlap (ratio): 0.1
Grid Junction Separation Band Height (layers): 10
Grid Junction Separation over Octogon Radius At End (ratio): 0.0
Grid Junction Separation over Octogon Radius At Middle (ratio): 0.0
Infill Begin Rotation (degrees): 90.0
Infill Begin Rotation Repeat (layers): 1
Infill Odd Layer Extra Rotation (degrees): 90.0
Grid Circular False
Grid Hexagonal False
Grid Rectangular False
Line True
Infill Perimeter Overlap (ratio): 0.4
Infill Solidity (ratio): 0.90
Sharpest Angle (degrees): 60.0
Solid Surface Thickness (layers): 4
Lower Left True
Nearest False
Surrounding Angle (degrees): 60.0

2. can i adjust width of column support of skeinfoge. like the black support on IMG_0119b.jpg
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