I have uploaded some new tuning parameter files to Sourceforge for the remaining NZ terrestrial changes.
The files are in a subdirectory of the v3.2 directory on Sourceforge called New Zealand Terrestrial Changes. Download the file(s) you need into the DVBT subdirectory of your installation and they should appear as options in EPG Centre on the Tuning tab when you try and change your existing parameters.
Remember to click the Add button when changing the tuning parameters in EPG Centre. It's easy to forget to do this and end up trying to collect data with the old parameters.