Hi, I'm playing with a Paladin with almost exactly the same stats as yours.
The only exception is that my Paladin has in both Per + Res 17 points.
I'm using him as a second tank next to Edér. I took also therefore the +Endurance aura.
I'm at the moment lvl 5 and just reached Act2.
So far I hadn't any trouble with any fight.
But yes, the damage output isn't great, but that doesn't really hurt me since I really want him to soak damage.
He performs quite well for this role.
I've put already 5 points into Athletics.
As far as I can tell from my experience now, the great deflection makes up for the loss on Constitution.