Aging Peach Wine and sweetening peach wine

Robert, add sugar a little at a time (as simple syrup) and taste test the result to arrive at the best balance. The sugar will balance against acid and alcohol. Getting that fine balance between the three is where the "art" of winemaking enters the picture, assuming your winemaking techniques are sound.

It is best to sweeten a sample of the wine first, recording exactly how much syrup you add to get the right taste. Then you sweeten the remainder using the same proportions. For example, if you have a U.S. gallon of wine and use a 250 mL sample and add x amount of syrup to achieve the taste you want, you then add 14x to the remainder to approach the same result. For an Imperial gallon using a 250 mL sample, you would add 17x to the remainder.

By all means, stabilize before sweetening.

Jack Keller, The Winemaking Home Page

Just to add to Jack's response in terms of when to bottle. For the dry wine, you can bottle any time after it clears. But for the part that you sweeten, it is a could idea to stabilize, wait a few days, then sweeten, then give it a couple of months to be absolutely sure that it is stabilized.

Ray