With regards to the tool number display, where is this being displayed? If in the long, segment LED display then 4 digit is correct; 2 digits for the tool number and 2 for the offset. If in a separate display, then this would be an OEM provided feature and is probably not parameter related.
I can provide you with a Generic set of parameters, but not from an Hitachi Seiki. It won't be for a few days though, I'll have to go to a client's works that has this control.
Please let me know if you want this Generic set, so as not to waste time.