Your text files should be renamed as formated like this O#### capital O not zero and up to 4 digit number without the .txt extention. There is a parameter that will allow the use of standard DOS file names.
The tool change parameters should be looked into on the Axis parameter page. Other parameters that may have some influence on the error would be positive and negative soft limits and actual home position values loaded after homing.
X Max travel inches -31.0000?
Y Max travel -18.0000?
Z Max travel -12.0000?
Tool Change Position
Z -XX.XXXX Relative to Z home position. Obtain this value by setting Z Tool to zero after homing, then jog or handwheel the Z axis to where the tool holder lines up to the carousel finger.