There is an adjustment for cable stretch at the lever assembly itself, but generally most drum systems just need the shoes adjusted. How much resistance was there on the drums when you spun them in direction of travel? They shouldn't freewheel or turn with just your hand on the lugs, it's a matter of feel (an oppinion), but you should have to use 2 hands on the drum to turn it if the shoes are adjusted properly. Did you put the park brake cables on properly? Did you put new hardware on? Or strictly shoes? Are you sure the return springs are located in the right holes? I know you said you took a before picture, but it can still happen.