The Ford drums are slotted so you can insert a .010" feeler gauge between the drum and shoe. With the Buick drums, you have to fake it. To set them by feel, turn both adjusters slowly until the same pressure is felt on both. Lock the bottom one there, and back the top one off just enough so the wheel turns free. From the look of the shoe on your other thread, the bottom adjusters were backed off some, causing only the top part of the shoe to contact the drum. Not real efficient, as you probably noticed.
Setting the brakes like I describe will cause a bit of premature wear on the bottom inch or so for a little while, until the shoes burn in, but the brakes will work as good as they can for all of that.