Buccaneer skill replacement levels

The title probably makes no sense.

I'm 146 right now, just passed demo 20 and it's level 8. After demo i am probably going to max energy orb. What i want to know is the following:

1) At what level does demolition out damage barr + DS.
2) At what level does energy orb out damage energy blast.
3) At what level does energy orb out damage dragon strike. (i'm pretty sure it's 27+, but i'm just curious)
4) By how much DPS does max energy orb out damage max dragon strike? Expressed in % difference is fine.

Thanks guys.

1. Somewhere around after level 21 Demolition utterly destroys the single target DPS of Barrage and DS. I remembered saving a good minute at level 21 Demolition at Dodo compared to pure Barrage and DS, and obviously only gets better from there. I save ~2-3 minutes using Demolition at Dodo with max Demolition.
2. No idea. I haven't had a point in orb yet.
3. I think at level 21+
4. Not sure