Agree....Aftermarket drums seem to come warped right out of the box and the aftermarket pads/shoes seem to create lots of dust. I've had to resort back to OEM drums and pads and wasn't disappointed. Other aftermarket parts may be OK , but the ones I've tried to use were junk.
Check to see if the dust is building up inside your drums when you remove them.
What I've always done, is to adjust the brake shoes with the drum off. Then slide the drum on and spin it while listening for touching, then not touching scenarios. If it's not too noticeable, you're good , but if its too bad, then the drum is warped and should be replaced.. After spinning the drum ,are they touching yet? NO? Then remove the drum and adjust a few more clicks. When I feel slight resistance when I spin the drum or they get hard to slip back on. I usually back off a click or two , then you're good to go. I agree that the E brake travel is a good indication of how close the brake shoes are to the drums, but after I adjust them like I've stated, the E brake travel is always minimal.
You should always change the spring hardware when changing the brake shoes.They are cheap and they make sure your shoes retract and stay in place.Good luck