First, it probably isn't 'L110 T0'. That means to set Wincnc to 'No Tool'.
Also, I think you should move your S4000 to another line. I think it will probably be ignored if it's on the same line as the M3. Wincnc likes commands to be on seperate lines.
Next, to set your feed rate of 300 for X,Y, insert a F300 before the first X or Y move.
Your Z has it's feed rate set on a Z move line. That's the correct way of doing that.
Hope this helps.