WhineMaker,
I mixed 1/3 whisky with 2/3 peach tea and allowed it to sit in the refrigerator for over 48 hour and I saw nothing out of the ordinary (although I will not try this combination again.) The whisky is 40 proof so that should put the alcohol content at about 7% which would be close to a 12 - 14% wine mixed 50/50 with c. light. This addresses the alcohol issue but none of the other issues occurring during your combination. I wanted to resolve this issue before proceeding with developing the "base".
e-wine