I knew Steve back in the mid 90s when he was in virginia. I can tell you he would make a very good used car salesman. However, if all you are looking for is Piega information, you should be fine.
I can't answer most of your questions. Mine came with spikes installed.
Not sure about the relative volume level of the rear tweeter, but my guess is it is lower than the front tweeter.
I don't think there are any retailers left in the US.
The bass control would actually cut the response at 40 hz. I ran mine full range. Great sounding speakers. I might actually have an owner's manual, I can take a look.
The only thing I could find was a single sheet of info on setting up the speaker and a Piega color brochure, neither of which I think would be helpful to you at all. Good luck, those are some great speakers.
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