If you have good braking then the ABS WOULD NOT BE THE PROBLEM.
BRAKE noise is usually from the pads being made of low quality material. also the back of the brake pads require a high temp anti seize compound to reduce and eliminate noises. your braking noise only at the slow speed is when this normally occurs. the pads/retaining clips also may have not been installed properly as well.
the rear drums with 80% of the shoe being worn may indicate they need adjusting not a new drum. drums wear at a rapid rate with the use of non ASBESTOS brake material.
with your vehicle the rear drums do a good amount of the braking effort.
do not blow out this dust material. use a spray bottle with some dish soap water mix in it. place newspaper on the ground under the axle to collect the dust then rap it up and in the trash. you do not need chemicals/degreasers to do this. these solvents are bad for you and the rubber seals.
brake dust is not good .