But according to my observations of steemit.com, I would like to see a hard fork only address one issue at a time. By making several changes at once, it is impossible to tell which of the variables lead to a positive or negative result.

I tend to agree. I'd rather see more forks with less changes than less forks with more changes. And I think most of the witnesses agree with this as well.

The biggest issue I have with the new fork proposal is that several of the changes just seem completely arbitrary and we won't know what changes made a difference, or if one change cancels out another. And I realize that my proposal consists of at least five changes, but those five are all inter-related and some of them can't be implemented on their own because they would just distort the rewards mechanisms further in the wrong direction.

I do agree that flattening the curves should be the first step, however. If we can do that and the results are good, then we can move on to the other options, if necessary. In any case, the curation rewards need to be improved and increased. It's the only purpose for holding STEEM/SP and it's the only non-speculative driver of demand, which STEEM is sorely lacking.