n00b Dragoon question

[h0tNstilettos]

So I just got Disembowel, which is the 2nd ability of the ID-Dis-CT combo.

My question is should I go ahead and replace TT-VT-FT combo with just ID-Dis? I don't have CT yet, but not sure if just ID and Dis are better than TT-VT-FT or not. The potency of TT-VT-FT still shows higher than the potency of just ID-Dis, but Dis also reduces enemy's piercing resistance. I'm not sure if that makes a significant enough of a difference over time to go ahead and replace the 3 skill rotation with the 2 skill ID-Dis or not.

EDIT: Nevermind, I just face palmed myself. I just remembered that the TT-VT-FT combo is still a part of the Dragoon rotation, so nothing is replacing anything, just simply adding to it, depending on how long mobs are expected to live.