Since it looks like you may be in the brakes a few more times -

You might use an old NASCAR trick - cover the lining area with a thin layer of chalk -

Then you can assess how much contact area you have between the shoes and drums. Make sure that the shoes fit the drums.

Also, be sure to adjust the brakes before you go for a ride even if you have self-adjusters. Self adjusters do not work that well - it takes several abrupt stops in reverse to get any sort of adjustment. Most people do not stop like that!

Some people have mentioned that the shoes are different - front and rear - and they have put two rears on one side and two fronts on the other. I always mark the shoes as I remove them, and compare new parts with old ones.

I recently read a restoration story where the owner threw the old parts away before he confirmed that the new parts were correct!