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I think they should have the same rep as ordinary posts. If they are high quality they will eventually accumulate a lot of up-votes over time. That's how the voting system is supposed to work, rewarding quality over time.

I have written lots of similar detailed papers or self-answered Q&A on SO and two of those I consider among the more important now sit at very high score "only" 3 years after writing them.

Also remember - if you write posts in the self-answered Q&A format, you _do_ get more than 1x the score, because the question often attracts its fair amount of votes too, not just the answer. And writing good questions can be tricky - ideally they should contain some good examples that the answer can refer to.

But then of course voting is never going to be completely fair since it is related to traffic. And answers explaining curious side-effects or oddities tend to get ridiculously up-voted.