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That's where I first heard of it.So Elector is the best treatment, and it kills lice and mites, right?
Here's an article by the Chicken Chick on Lice and Mites, it mentions Elector as best treatment for mites but no mention of lice.
https://the-chicken-chick.com/poultry-lice-and-mites-identification/
Usually treatment consists of 5-7 days of the severe outbreak dosing (2tsp of liquid Corid or 1.5 tsp of powder Corid to gallon of water) and then if needed another 5 - 7 days at the reduced dose (1/2 tsp of liquid or 1/3 tsp of powder per gallon of water). I've never actually had birds with a deficiency post treatment, but it's possible. Once treatment is complete you can give a 1/2 a B complex tablet or capsule (human ones) for a few days or a week, the B's are water soluble and any extra will be excreted. If you have a bird that has symptoms of a deficiency I would give to that bird until it's symptoms resolve. Don't give thiamine at the same time as treatment since it could reduce the effectiveness of the corid.
Since you seem to have it running through your flock, I would just treat them all at the same time, rather than one here, one there, as they become ill. For very sick birds that are not eating or drinking I would give them a stronger oral dose once a day for up to three days, instructions for that are here:
https://www.backyardchickens.com/threads/corid-oral-drench-instructions.1211991/
That will help get the medications in them until they are eating and drinking well enough on their own to take it in. You can still give them the corid water via syringe also. You give the drench in addition to the regular treatment.
Depending on the lice load and how long they've been there, that can seriously weaken them also.