So I have a question. Its obvious you keep Demolish(DS) up, but I am conflicted about ToD and Fracture(Fct.)

I know that before a certain amount of skill speed you cannot keep up DK+Twin Snakes(SN) and keep up all 3 dots, you have to choose between one or the other, or let the buffs fall for a few seconds.

The question is, which dot is best to use (ToD vs Fct) in terms of TP management and Damage. Maybe I have it all wrong but if someone could help me with this I would be thankful.

Also I am a bit confused about weaving Impulse Drive into my rotation. Is this a high Skill Speed option only? Is it actually necessary to compete with others DPS?