Hello! More questions but this time I have a little clue atleast :)

[Rasah]

Looks like most of the questions have been answered for you. As a higher level druid, here is an example of what my soloing spells are that I have memmed:

Root, snare, gate (just an old habit), Drifting Death (65/tick), Drones of Doom (34/tick), Creeping Crud (21/tick), Immolate (24/tick), DD spell. All of those DoTs stack, and they are all more efficient damage/mana than using a DD.

So that's 4 DoT's, 1 DD, 2 movement impacting spells and 1 utility.

I give up some efficiency to load up all of the DoTs at one time, but I'd rather be done with mobs after 1 minute instead of dealing with it for 2.

As far as the DD, it depends on what you are doing. One mob that I am currently killing takes a root, 4 DoTs, and a DD when he gets to about 7%. However, I only need the level 19 DD to finish him off. I can do this because I've killed countless ones and it is always the same. As you get more experience with it, you will learn what is most efficient for you and your play style.