Sound recommendations, Dave!
I did dab a small amount of grease on the internal shaft parts (maybe not a great idea since it will attract brake dust, but I haven’t had any issues).
Supposedly, the grooved EBC shoes are designed to channel dust and debris away. I don’t buy the hype, but it probably helps when the shoes are newer. Eventually, the shoes will wear down and the grooves will be filled with dust…and the dust has to go somewhere. It will always be in the drum regardless of grooves or no groves. Ya just gotta clean no matter what. And tire change intervals give you a good brake cleaning time interval.
I installed these Niche brake shoes on a previous S40 I had. No issues - I give ‘em 4-5 stars. I won’t buy EBC stuff anymore after seeing a pair of disc pads completely separate from the plates.
At the end of the day, a drum brake is never going to have great stopping power and performance regardless of which brand of shoes it has installed. Plus, I mostly just use the rear brake to illuminate the brake light and signal traffic behind me. I do 70-80% of my braking with the front brake (and engine braking).
NICHE SHOES ——>
https://www.amazon.com/gp/aw/d/B07Z1QRSP7?psc=1&ref=ppx_pop_mob_b_asin_title