I'm thinking about blending some kit wines that I have made and already bottled. I want to blend flavors but also adjust PH and add some sugar (and add potassium sorbate). Is it a bad idea to un-bottle, blend/adjust then re-bottle? I'm looking at it as an experiment as much as anything but I'm wondering if I could get so much air exposure - or something else - that I might ruin everything. The kit wine I'm working with is at a year old and the PH has reduced along the way down to the 3.3/3.4 levels. Any thoughts and guidance would be appreciated.