New to DPS advice

[Rongway]

Keep dots up at all times and refresh them at 3 ticks or less without letting them fall off
Melee Limit Break on single targets ( I don't care how cool your RDM lb looks)

You might have meant "at 3 seconds". One tick is every three seconds, and the server tick does not necessarily line up with anything you have done.
To OP, DoTs are great. Especially with the addition of AoE thunder spells. Thunder spells are sometimes your highest damage ability available, if they'll tick for the full duration.

In re: Limit break, LBing single targets is a waste. See previous post:

A caster LB1 on just 2 targets does more damage than a melee LB1.
A caster LB1 on 4 targets does more damage than a melee LB2.
A caster LB1 on 7 targets does more damage than a melee LB3.

Caster should use it early on a trash pull, then again on a late trash pull. If the bar is full before the boss, it should only be saved if the boss has three or more simultaneous adds.

Melee DDs shouldn't LB except on primals and in non-alliance raids.


(For comparison, in a full party:
A caster LB2 on 4 targets does more damage than a melee LB3.
A caster LB3 on 2 targets does more damage than a melee LB3.)

So if you like playing casters, get used to the idea of LBing big trash groups.