I tend to create largish posts too, simply because either they are either statistic based or because I put quite a bit of thought into them, and often come up with ideas that simply do not fit into a short paragraph. So no issues with long texts on my behalf if they are well structured, understandable and thought through.

Everyone who has ranked here in a decent amount of time since the Merit System kicked-off has his bag of dos and don’ts based on his own experience. These are not universal for everyone, but a common factor of the dos would include the highlights you’ve pointed out.

One basic thing to consider is post history. When awarding merit, one tends to look not only at the post, but also at the poster’s posting history track. If it is full of bounty reports and/or one/two liners with no added value, then the member may well go unmerited even if the post being scrutinized is decent.  Often, a decent post that stands-out immersed in a bad posting history is a good indicator of plagiarism too.

This is obviously not your case, since you have a good history track, but the above just goes to back your quality over quantity point, stressing how important it is to have a balanced history abiding by this factor.