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Any way if I'm causing ID due to a weapons strength being double the toughness of a model do I still have to roll to wound?

I'm not sure (probably cause I'm not reading the rule book properly) I if anyone could enlighten me it would be great.

Yes.

(There is nothing saying not to--it is not that you are not seeing it)

In addition, your opponent gets to make their normal (armor, invul, or cover) save against the wound.

It's only if the weapon hits, wounds, and goes unsaved that it becomes ID.

Aye, for example shooting a Marine Captain (no upgrade) with a Krak Missle, the missle takes away his normal save, so he has his iron halo to save him or is ID'd

Remember a 1 is always a fail even to wound

Instant Death occurs for an unsaved wound. So you roll to hit, then wound, then the enemy units makes saving rolls or , int he case of a power weapon, invul saves. If the rolls fail the unit is removed from play as a casualty regardless of remaining wounds(unless an ability or special rule prohibits the character from suffering instant death).