I think you need to really focus on the language of the document. The diction, as some of my old creative writing teachers used to tell me, needs to be more focused and more concrete. For example:
Foundation personnel tasked with containment, research or custodial duties associated with SCP-XXXX are restricted to a diet of fruit, vegetables and nuts only.
I think it would be more effective if you changed the last to "Foundation personnel tasked with containment … are restricted to a vegan diet." In this way, the sentence is clear, simple, and to the point unless there is a specific reason why they need to eat those specific foods.
Also, on that vain of syntax and sentence structure might I suggest instead of: "Daily vitamin supplements will be provided with all meals and are mandatory," that you instead state. "Mandatory daily vitamin supplements will be provided with all meals." Just look at your sentences in this way, as if it is a report, a concise assignment, and it will help.
I'm also not sure if you should explain that they are not to be exposed to any animal dead tissue or animal products in general. Procedures need to be outlined, and not necessarily explained. Personnel need to follow orders. Somewhere in the Description of your document a description of the animal meat and products, and their effects would hit that home more directly.
Might I also suggest that you substitute Port-a-Johns with "portable waste disposal facilities." It makes it sound more technical and clinical, as a Foundation report and document should be. Port-a-Johns sounds too commercial and, honestly, kind of crass.
Also, I would suggest changing "countermeme" to "countermemetic." A countermeme, at least to me, sounds like something you would find on an Internet Forum instead of a scientific paper. A counter-memetic sounds more technical, yet again and in some ways more fearsome too: like an actual weapon or a potentially deadly tool if used by anyone other than an expert.
Just remember nice clipped, clinical, cold, technical language. From what I've seen, Procedures are instructions, and practically commands. Discovery and Description can elaborate further, but they should be very empirical: factual. They are recorded observations of phenomena.
I also agree with rubberchickenzilla in that you need to know when it is appropriate to use redactions
and expunging. Too many redactions can be distracting. When they are used, they are used to censor sensitive information, and they should be — from my understanding — used sparingly and to help actually tell the story. Just some things to think about.