The physical DPS build is fine but there are some stuff that might need some modification IMO and it is as follows:
1-If I were you I'd pick the 3 righteous rage CDR rubies in retribution grid as this skill gives paladins a great surge of energy which enables them to do their max potential of DPS so having it at lower CD is always welcome and kinda necessary.
2-Autodaf is more PVP oriented so for a PVE DPS I wouldn't recommend prioritizing it specially when its about physical DPS PVE paladin.
3-Overcome rank 3 isn't as much useful as rank 1 deliverance +rank 2 tenacity and you can calculate it yourself.The more barrier managing skills the better since physical DPS paladins don't have barrier skills' CDR rubies and take in much damage.
4-Ferocity aura makes you more useful for the party by adding an additional aura assuming you have no warrior in party or that your warrior is your tank.Yes it makes your defense far less but if you're attentive to your barriers and evade most annoying AOE s etc,you should be okay.Don't forget its 15% more damage and damage affects the heal gained from blood lust so if you have good blood lust it will make up well for the loss in the armor from the aura specially if you do energy buff more often+using Alchemy energy pot
5-I wouldn't take cannon of light boost rubies as a priority for physical DPS paladin since Physical DPS paladins rely more on energy and specially you didn't take even r1 immobilize though this patch is far more than interdiction +less CD+the slow affects some mobs (which makes it better for boss fights etc)
6- you took a second stamina ruby and yet didn't take deliverance nor r2 tenacity and preferred r3 overcome which has like 10 sec CD and the difference between r2 and r3 isn't worth it specially for physical DPS paladin but anyway its up to you..If I were you I'd take 3rd barrier ruby instead of this stamina ruby though it won't a boost to DPS either and the best choice instead of this stamina ruby would be the brutality ruby( the dark green pot ruby in crusader blow grid)for most DPS outcome.
These are just some logical ideas that might help and good luck!