Here is what I would get for the same type cut.

N0000 (Filename: CutSquares.tap)

N0010 (Post processor: MP3000-DTHC-SmlArcFix#3.scpost)

N0020 (Date: 01/30/12)

N0030 G20 (Units: Inches)

N0040 G53 G90 G40

N0050 F1

N0060 (Part: CutSquares)

N0070 (Process: Inside Offset, 1, T3: Plasma, 0.06 in kerf)

N0080 M06 T3 F60 (Plasma, 0.06 in kerf)

N0090 G00 X6.2292 Y4.7488 Z0.5000

N0100 G28.1 Z0.50

N0110 G92 Z0.0

N0120 G00 Z0.1370

N0130 G92 Z0.0

N0140 G00 Z0.1200

N0150 M03

N0160 G04 P1

N0170 G01 Z0.8000 F60

N0180 G02 X6.1332 Y4.8448 I0.0000 J0.0960 F60.0

N0190 G01 X9.1316 F60

N0200 Y2.1095

N0210 X6.1332

N0220 Y4.8448

N0230 G02 X6.2932 Y4.6848 I0.0000 J-0.1600 F60.0

N0240 (Process: Outside Offset, 0, T3: Plasma, 0.06 in kerf)

N0250 M05

N0260 G00 X12.1260 Y12.1260 Z0.5000

N0270 G28.1 Z0.50

N0280 G92 Z0.0

N0290 G00 Z0.1370

N0300 G92 Z0.0

N0310 G00 Z0.1200

N0320 M03

N0330 G04 P1

o549

N0340 X12.1260 Y12.1260

N0350 G02 X12.0300 Y12.0300 Z0.8000 I-0.0960 J0.0000

N0360 G01 X12.0000 F60

N0370 X0.0000

N0380 G03 X-0.0300 Y12.0000 I0.0000 J-0.0300 F60.0

N0390 G01 Y0.0000 F60

N0400 G03 X0.0000 Y-0.0300 I0.0300 J0.0000 F60.0

N0410 G01 X12.0000 F60

N0420 G03 X12.0300 Y0.0000 I0.0000 J0.0300 F60.0

N0430 G01 Y12.0000 F60

N0440 Y12.0300

N0450 G02 X12.1900 Y12.1900 I0.1600 J0.0000 F60.0

N0460 G00 Z0.5000

N0470 X0.0000 Y0.0000

N0480 #650 = 60.473 #651 = 2

N0490 M05 M30