They way status elements proc is weird in POE. The formula for if a status procs is

(amount of damage that can apply affect * (100 - resistance of enemy to damage type)/100) / enemy max health.

So if your status procs as if it does X% more damage, it just gives you a higher chance to proc the status without increasing your damage.

See here for a more in depth explanation.

They way status elements proc is if you successfully roll a status proc based on your the chance to inflict status, and the enemy fails to resist the status, or if you inflict a critical strike.

Status effects, such as shocked which allows you to deal up to 50% more damage, are based on the amount of damage you do. The higher the damage you do when you proc shock, the higher the percentage of extra damage you will be able to have on a shocked enemy, with a minimum of 5% and max of 50%. The exact formula is shown below, where D is your total damage that can shock, T is is the enemy's ailment threshold (normally their max health), and M is the sum of the attacker's increases to the effect of shock (comes from X% increased effect of shock modifiers).

So, shocks as if dealing X% more damage modifiers help increase the effectiveness of you shock procs, similarly to X% increased effect of shock modifiers.

See here for a more in depth explanation.