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And still no update. Less a question, more a comment. Feeling a bit of deja vu here.

Good answer. I do think, though, that Moz might have to field less concerned individuals complaining about drops in DA if 100 represented a number of links no website will ever reach.

If the scale has to be normalised every time the index is crawled because the ceiling sites are snowballing links at a rate at which the rest can't keep up, perhaps it's time to look at the scale?

No earthquake can be Richter 10.0, and that's in the design. I understand that DA is also a logarithmic scale but clearly not one robust enough to prevent this constant renormalisation.

There are a bunch of tools out there. Longtail Pro comes to mind. All of them share a problem, however – noise! That is, the useful sliver of their output often requires such a lengthy period of manual disinterment, you might as well do it the old fashioned way. No keyword tool I know of can be easily told what's pertinent to the context in which you wish to use it.

The best advice I can give you – assuming this is for content creation – is to use the SERPs themselves.

If you Google the short tail, you'll find some if not all of the long tail stuff in the H2s and H3s within the content you're presented with.

Hope that helps.

Dan