I wouldn't add water or witch hazel because then you get into a preservative issue. In my never-to-be-humble opinion it doesn't need anything else. I have not yet done just cyclo and FO, but may try that with a 5oz batch. Yes, the ratio would be what you have for 10oz. That's the reason I use percentages rather than actual amounts, so you may apply that ratio to any measurement you use, ounces, grams, etc. We may be hijackers but we sure ain't thread KILLERS, are we?