Since tightening the leg bolts puts equal pressure on the inside and the outside of the cabinet at the same time over tightening the bolts can't be a factor in cabinet splitting. The threads will strip before any wood damage.

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The post rubber sticking up? I'd try gluing it onto the post. You could drill and tap it, add a flat top machine screw and washer if you really want to get creative.
Seems like the rubber may be a little thick, getting hung up on the playfield when the post goes down. Maybe a thinner rubber would solve it?

It's one of the set of standups you complete before you can activate 2x playfield.

Pinball Browser to swap out sounds.

It means he thinks it's beneficial to give the playfield finish extra time to cure beyond the weeks or months it sat at the factory before Stern installed it. It's unlikely to have any discernible effect.

If you're going to the trouble of replacing songs why bother with music you don't like? You would have to create your own instrumental versions of the songs if your goal is a song of the same length with any snippets in the same place in case they are used for other sound effects, they don't currently exist. I would think karaoke software is most likely to do that.