Moved to bugs and fixes, cause that's where the thread is heading, I can feel it.
F1 settings simply don't change whatever the veggy repop values are. It's not programmed to.
A good F1 setting might be 30 vegs repopulated, with a threshold of 10 and a cooldown of 0.
No default settings exist as of yet, you may need to experiment to get a good setting going.