We don't think the coefficient needs to change. We literally just added the duration bonus from the old glyph so that you didn't need that glyph to function. We could have a long discussion about mandatory glyphs for dps specs, but let's not have it here. :)

The dot coefficient rule that I think you're implying isn't necessarily something we follow anymore.

You get two more ticks on Flame Shock, which frees up GCDs to cast other spells. If the glyph was a dps increase, and it generally was held to be, then the change to Flame Shock should be too.

We aren't changing the set bonus. Most shaman will outgrow it eventually. If you have the set bonus, you can look at other glyphs for the moment if that works for you.