I know it's not an answer to the question, but instead of the mini-parse, I used a method to paste only Nexona incoming dps using the DoFileCommands plugin.
Here's the basic step-by-step
1. Selective Parsing/Combat Limiting/Only Record Actions by....
2. Add Nexona and have it checked
3. Install the DoFileCommands plugin. Direct Link:
Advanced Combat Tracker :: View topic - DoFileCommands v1.0.1.6 [Jarva]
4. Setup the plugin, I won't go into detail since there's a nice writeup on act's forums. You can use the default, but set "Lines: 1". Make sure Channel is set to your parse channel or raid, or something people can see so they can adjust for themselves. This makes it only paste the header line, which on default is Time, Mob Name, and EXTDPS. Also make sure to hit enable and save before you move to a different window and forget.
5. Make an in-game macro, Command: /do_file_commands textfilename.txt
6. /act end at regular intervals, then hit the macro button. (If you don't /act end, act will round out the ext dps.)