This is how Destiny's Level system works: If you are 1 or 2 levels below the max level then you do a 40% less damage if you are 3 then i think it's 60%(correct me if I'm wrong). Any lower then you wont do any damage at all. Now if your equal level or Higher you will do the MAX amount of damage to the enemies. This is why a 30 with a weapon that has the same states as a level 14 guardian while versusing a level 14 enemy Dreg will do the same amount of damage. The ONLY way to do more damage is to have a Weapon that has a higher ATTACK value. In VOG 300 attack weapons at level 30 do 890. 331 weapons do around 960 ish i believe in VOG.