+4CON -4DEX + Stun & HP Reg but slow
+4CON -4STR + Stun & HP Reg but less Damage
+4CON -4STR + Stun & HP Reg but less damage
+4MEN -4WIT + M Def but slow Casting Speed
Leave ur stats alone. You need STR to hurt the mob, you need DEX to hurt the mob/defend with your shield and you certainly need CON to provide resistence to take damage.
Of all the classes i would say that tanks are the least suited for stat changes, besides your a human, you have good stats already and doom heavy bonus is plenty.
Damage > Defense , if you never PVP. In PVP, a tank needs every bit of hp he has.
There is no good "100%" solution for DA's. You need as much of every stat you have. I've found that not doing anything to your stats is about the best thing you can do if you PVP.
If you really want extra damage PvE, craft up a Blue wolf armor set in addition to your doom (or, if you're rich, get a tallum set too). It's like free, exchangable tatoos. :D