I agree with Chip , You don't currently have enough lever travel to engage the brakes fully . . Also , see if you have an old time brake shop in your area . If they can turn drum brakes they should also be able to grind your brake shoes to give you a more fuller contact area . Right now your using very little of the brake shoe surface . Grinding the brake shoes will remove material from the high spot allowing more of the shoe to contact the drum .
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