tested with corsairs and AM against craftworld eldar. the holofield strength is not reduced, if your line ships weapons hit or more specifically in the case of lances do hull damage against a ship with holofields and ships are not prevented from regenerating its field for 10 seconds after getting hit by your ships with this upgrade.
disruption overcharge / spirit crystal lense still not working properly
Hi @Fosil
Thanks for reporting this, I've passed it on to the dev team.