It looks to me like they still may not be getting enough fertilizer. What strength and how often are you applying the liquid fertilizer? Maybe the current fertilizer you are using is flushing right through the sandy soil you have.

Try buying some good balanced, granular fertilizer and working into the soil around your plants.

Good Luck!

granular fert, mulch, and keep watering. looks like there growing in the desert.

If I fertilizer on them will they re-coup or should I jerk them out and start over? The mounds are solid roots, but will the plants come back to life?

"granular fert, mulch, and keep watering."

This is sound advice. Based on your pictures, things look fairly hot and dry. The plants look a little nutrient starved, but that may just come from fast draining / fast drying soil. I'd mulch heavy with an organic mulch (straw, hay, etc.), keep them well watered, and see what happens.

If you already added some fertilizer and cow manure, you may not need to add anything. It's possible that the whole issue is the lack of mulch / lack of water retention. If you are unsure whether you need to fertilize or amend the soil, get a soil test done. I'd recommend getting it done anyways, since you're new to the house and probably never had one done - it'll be good to know where your soil stands as-is.

"... should I jerk them out and start over?"

I definitly wouldn't do that. If lack of fertilizer is the issue, putting new plants into the same spot will just give you younger plants which will develop the same way and yield fruit that much later, if at all. And, yes, they will come back to life if the issue they are suffering from is corrected. I'm assuming it has more to do with watering than fertilizing (based on your zone / location and the pictures).