Spiritualist: "Dedication" phantom damage

[Galatina91]

First of all: does a 6th level phantom qualify for the Improved Natural Attack feat? I suppose so, since "Slam" is a natural attack.
So if I'm level 6th, and my phantom normally deals 1d8 Slam damage, this damage gets improved to 2d6 with Improved Natural Attack.

If so, does the feat applies to both attacks?

Dutiful Strike: If I have a "dedicated" phantom, and I get attacked by an enemy, the phantom deals improved damage to that enemy for 1 minute. The ability doesn't have a limited number of uses per day. So every time an encounter starts, if I get into melee and get to be attacked by an enemy, the ability triggers.

What about the combined effects of Dutiful Strike and Improved Natural Attack? My phantom deals 3d6 points of damage, per attack, at level 6, is this correct? 2 attacks per round, that can benefit from Weapon Finesse, for a total of 5 (BAB) + 3 (dex) + 2 (Dutiful Strike bonus).

That's a +10 attack roll for 2 attacks, 3d6 damage each. Correct?

I'm asking this because it seems a lot...

[Chess Pwn]

that's correct and it's not that much damage. a fighter at lv6 could have a +14/+9 for 2d6+10. This is before he gets enlarged, or recieves haste. He just has a belt and +1 weapon. Your 3d6 averages to be like 10~11 damage. Like I said, it's not that much damage.