My sizes are out

[Doddy]

Ignoring all the individual line segments...

X lower extreme = 6.35, higher extreme = 43.65. Tool size specified as 12.7mm (6.35 rad), defines a X range of 0..50mm - I guess the operation...

line 231:
G01 X43.650 Y6.350 Z-3.000
G01 X43.650 Y43.650 Z-3.000
G01 X6.350 Y43.650 Z-3.000
G01 X6.350 Y6.350 Z-3.000

is the finishing pass, and should leave a 50mm pocket. Provided that your cutter is 12.7mm diameter.

The code is right (at least that should leave the pocket at the correct size). I'd look to answer Jazz's question on measured tool size. Beyond that, looking at the input to the DDSCV controller (GCode) is correct, you have the configuration of the DDSCV itself that I cannot advise, and the output measured... I'd say the controller is looking suspicious.