What madscientist said, "You need to correct your rocker geometry."
You pictured a lot of messed up push rods and yes I suppose it could have been from neglected adjustment but you'd have to neglect them a lot for that kind of damage. Across the counter push rods might work just fine in most cases but viewing your pictures raises a big red flag. From what I see, I would suggest you get yourself a couple of push rod length checkers and read all you can about valve train geometry.
At the very least I would suggest you get some marking compound such as Prussian Blue and coat your new push rods in critical areas. Turn the engine over and then check for witness marks on the push rods and the head.
There's just more in those pictures than a simple defective push rod or poorly adjusted valve.