This year I had horrid damping off with okra in the greenhouse. And then I accidentally ran the tractor/tiller over the patch in the fall. But I still went out and scrounged for seed pods. So overall progress was meh...
I don't select for "same-ness" in my landraces. As long as it's a tomato, and it produces acceptably in the available growing season, then seed is kept for next year.
My plant breeding strategy is closely related to the hard-scrabble methods of the northern Sioux.
Here's an example with common beans: A species that is about as promiscuous in organic systems as modern tomatoes. Sure, those pink beans do the best of any variety of bean in my garden. But while planting, I make sure to plant plenty of the other types of beans. One of these days, I might pull that pink bean out, and turn it into a variety.