I’ve found in my very limited experience that the skin packs have a lot of sugar. Those packs are like skins, seeds, stems and sugar syrup or juice concentrate.
Perhaps you could use the skin packs and add your grapes to avoid having a much lower SG?
Or try adding your grapes first and then add enough of the skin pack to raise the gravity?
Perhaps you could use the skin packs and add your grapes to avoid having a much lower SG?
Or try adding your grapes first and then add enough of the skin pack to raise the gravity?