Hi christian - and welcome. To make a sweet mead you need about honey as you need string to wrap a parcel... Get it? Honey essentially feeds the yeast sugars and the yeast convert the sugar to alcohol. There is nothing in that "formula" that talks about "sweetness". To make a sweet mead you need to do one of two things - either feed the yeast more sugar than they can convert and unless you are very familiar with different strains of yeast fermenting under different conditions knowing what that amount is is a crap shoot, OR you decide what the amount of alcohol you want in your mead by determining how much honey you want to dissolve in what quantity of water and then you allow the yeast to ferment that brut dry so that there is not one gram of sugar left, you stabilize the mead to prevent any further fermentation and you add more honey or sugar to sweeten it to the level of sweetness you want.
If this makes little sense then your next step is to check out some mead making books. Steve Piatz is a good one and Ken Schramm is a great one.
