Jon,
I'm glad to help! Other than a few months here and there when I use a 1993 DD, my laundry has been washed by belt-drive Kenmores for my whole life. That's why I have come to enjoy them so much. I had a lot of exposure to a bunch of different machines to work on in the 1990s, and more again now. I'm glad to be able to share what I know.
Bleach hoses, if they leak, do so where they meet the side of the tub, which is about an inch or two above the baseplate. Evidence of leaks there are often most easily visible when the tub is out of the machine.
The solenoids for the bleach and softener reservoirs are often noisy. If nothing else, they can make a loud pop, almost like gun fire. The may also buzz while energized, though I have not heard more than a hum. Wigwag solenoids make noise, and certainly the mixing valve solenoids do, so it would stand to reason that a dispenser would as well. I would not be concerned about it.
Snubbers, no matter how clean, can make a lot of noise. I know I've said that before, but it's true. I am using three machines right now, and each makes a varied snubber noise not exactly like any of the others. If there is any porcelain wear on your snubber surface, or any hard water deposits, I would wager that at least much of the noise you are worried about is coming from there. It's amazing what the snubber accomplishes for these machines, but its equally amazing how obnoxious they can be.
That's a shame about the adjustment nut not being there, maybe they came later than 1970, or were only for large capacity machines? I prefer them not to be there actually (they're a pain when they need adjustment) but in your case one would be nice. As long as the basket drive can grab a full tub and make it spin, it's working fine.
Have a good Sunday evening Jon.
Gordon