I have found that those springs are on the weak side especially when there is some friction in the flexible cable guides. On my car there are additional return springs fitted, to assist the original springs. (purists forgive me!)
If it comes to adjustment, the brake shoes are adjusted first, and then the cabel is adjusted in lenght so that after the first 3 clicks on the hand brake lever the shoes start to bind on the drum.
I hope that helps Karl