Hi Frank, glad to see you join the Forum! And sorry to hear of your trouble with that first roll loosely wound. I think you're quite right about the cause... Somehow that roll must not have started off taut as it should be, and that created the problem at the end.
The small chrome spring-roller in the left-side feed chamber I think just keeps the film from loosening up on the feed side. The roller certainly isn't designed to offer any resistance to the movement of the film.
But the "spool axle" for want of the correct term, at the top of the feed chamber, notches into the keyway at the top of the spool, and for a reason. There's a brake in the body above that to provide some resistance to the rotation of the feed spool, in aid of tighter takeup. You might try rotating now-empty feed spool to see how much resistance to rotation you feel. In mine it's not a lot of resistance, but it obviously isn't freely rotating either. Too little braking action might lead to loose takeup.
On the takup side chamber, there's a larger chrome spring/roller to help get the film on the spool snugly. This camera has clearly been designed to avoid this loose takeup problem. But as I load the film, I commonly press my thumb firmly on the feed-side film as I use the film-advance to get the roll around to the start marks. I think that's a good habit.
Glad your second try worked better. Maybe you applied more resistance this time in getting the film started. Different brand spools shouldn't make a difference. And nice to hear the negs look good! Always encouraging.

(BTW, that magnifier is a "loupe")
The "CLACK" is a feature of this camera that I think was deliberately added in. If you use the self-timer, the CLACK comes at the start of the delay sequence, and the shutter works later with a soft click, so it's not inherent in the shutter itself, but in the tripping mechanism.
Why is it that way? Who knows, but it certainly alerts the "victim" they've been snapped, so sneaking around doesn't work! A few years ago on vacation at the beach I was wandering along a little-trod section, well up away from the wave line. I came up behind a young lady reclining on her blanket, no one else around, with a nice view down the coastline. As two runners came jogging along the wet sand lower down I snapped a picture of the scene. Poor young lady almost jumped out of her skin, she was so startled by that CLACK!
When I had my camera overhauled by CameraWiz (broken lens mount etc), I asked if he could remove that sound, but he said it was built into the shutter.
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