Hi Erik,
I'm not really in a position to help you just now - I'm really busy, and this will take time. However, the original comment still stands. Currently you are using long sentences designed to sound right for the context. Unfortunately, they're not quite right, and there is a lot of room for interpretation.
Your English is way, way better than my German, so I don't really have a chance to help. However, if you give a simple explanation, in English and German in parallel, and keep the sentences short and clear, perhaps someone can help you draft a complete English version.
As I say, I don't have time right now, but I think that's your best chance of getting some help. I can put you in touch with a professional German->English translator, but that would cost real money. He is extremely good, and in great demand.
No harm in asking for a quotation.
http://mussett-sprachen.de/