Glad you like the spot with the great hart's. I think that spot is sometimes called Healer's Grove, but I'm not certain. If you're saving leather, the other nice thing about that spot is that occasionally the gypsies will set up camp nearby and you can bank the leather pretty quickly.
At the gaman spot near Zento, the gaman respawn pretty quickly. Sometimes you have to look around for them a little, but there will always be two. It's another risk-free spot.
I can't remember how many gaman spawn at the spot below the Homare-Jima gate. If you don't find any directly below the gate, run NE (don't go the other way!) along the road until you run out of houses and you should spot some more. That area is usually pretty safe, although you do have the chance that a ronin, a ninja, a bake kitsune, a tsuki wolf, a revenant lion, or a yamotso warrior will be hanging around in the area from a previous encounter with someone. But the gate's handy if you need a rez and there's usually a healer monk running around just to the north of the gate. (The monks are kind of fun to watch if something "bad" spawns, as they'll attack it for you. Sometimes the gaman will go after the bad stuff too, like the yamotso warriors. But generally they're very placid.)
