1. Get the reference data for your version of Sins. Someone will probably give a link if asked, otherwise their are GUI programs like Harpo's that will convert the Sins files into readable format, or the cmd line program that you can find in your Sins of a Solar Empire folder (if you don't know what a batch file is don't try this method).
2. Find and copy the file "BuffShieldProjection.entity" from the reference files.
3. Go to your mod folder. Create a new folder. In that folder, create another folder called "GameInfo". Paste the file in their.
4. Open the file, and find this section of code.
numInstantActions 1
instantAction
buffInstantActionType "PlayPersistantAttachedEffect"
instantActionTriggerType "OnDelay"
delayTime 0.000000
effectInfo
effectAttachInfo
attachType "Ability"
abilityIndex 0
smallEffectName "Buff_ShieldProjectionChanneling"
largeEffectName "Buff_ShieldProjectionChanneling"
soundID ""
and replace it with
numInstantActions 0
5. Save the file. Start the mod and you are done.
By the way, really its better to get more Progenitor motherships to replenish your guardians' shields than to get more guardians. I usually only get enough guardians to cover my entire fleet plus a few extra, and rely on the Progens to ensure they can keep up their shield array.