Glad your finding some interesting results.....keep exploring.....
side tracks when we forget that the Whirlpool versions do this 'step down' agitation for a Normal/Regular cycle, some offer a 'heavy duty' in which its high speed the whole time....just a variable of cycle options and how it handles things for different models...its mainly designed for fast agitation at the start to flex the clothes, and then the gentle to allow the detergent to work on the stains and hold in suspension until the drain....odd, but effective
seen some with the SuperWash, wash for about 6 minutes, do a soak and partial drain, refill and continue into the normal cycle.......others just do a Soak and continue on, seems like no two are alike...as you go on, you will discover what each cycle of your model actually does...
curious if the other machine operates the same way.....what exactly is missing from that one, I know your considering it for a spare parts machine, but at the same time, could be a full spare, ready for service, just a thought.....
dryer seemed a bit higher on the line compared to the washer....expected the same amount of buttons, or what I call a one dial wonder, the timer has the temps and push to start built in.....if anything, just give it a good cleanout inside, and some lube on the rollers, and you should be good to go....
I think you did good with this set.....I like using the spinners as well, just to see how much more water can be extracted....