Why can't I dent any body's health in Cyrodiil?????

PvP Stats:
Magika - 34'000
Spell damage - 3225
Penetration - 5000

War maiden - 5 pieces
Rattlecage - 5 pieces
Grothdar - 2 pieces
All Epic standard bar one which is Legendary

All armour, skill and weapon passives bought.

Cyrodiil Sotha Sil Campaign

My character is built for picking off stragglers and dealling the top most damage possible. I know this as it is successful in PvE. But as soon as i enter Cyrodiil PvP i literally cannot dent anyones health bar past 95%

Any thoughts, opionins and advice i'll gladly accept