Your absolutely right, it IS hard to avoid foul hooking when casting to stacked pools. I break off when I can, if it does happen, and don't fish the real heavy pods for that very reason.
I hooked 2 kings this AM in the lower Salmon, landed one, and both TOOK my fly. Granted these were FRESH fish(probably in the river mouth less then an hour), but the impulse assertiveness is still there. Thats why I like fishing the lower river/mouth. Actually, I will be heading out in the boat this PM to cast streamers at the mouth, i have had good luckwith that technique in the past