I also have Epic Weapon Spec. So I should have an effective +40 damage bonus with the x2
That in mind, I believe I should never do less than 40 Damage to this dummy with a +4 weapon with 2 bonus damages and the dummies 5 damage resist.
The AB does work, to test. Equip the weapon, log off. Log back in with it equipped and that will not yet apply the +2 AB until you re-equip. I go from 44 to 46 as should be.
Sheet still shows the +17 STR +6 Epic Weapon Spec +8 for the 1.5 STR bonus = 31