My 2nd , recent batch of wine I started with ... 4 96 oz bottles of pure welches white grape juice, water to get 5 gallons. I added sugar untill I got a starting SG of 1100. I added appropriate yeast nutrient. fermentation went good. according to math and from drinking a little one thing I did learn is the staring 1100 SG did obtain a high alcohol content as it don't take a lot of this wine to get you buzzing. However, It is very strong! Its got a real bitter taste, its almost like a hard alcohol as far as bitterness. I've experimented with back sweetening a bit glass by glass with adding sugar and then I tried adding welches raspberry pure juice concentrate but it still tastes like sh!t, this tames it out a little bit but its still a little bitter and not like a real wine. At this point I got a whole carboy full of the original stuff yet and bitter or not I will drink it up but I im very disappointed and am confused what mistakes i may have made. I not sure what to try to tame down this wine now. Should I thin it with some water perhaps ? or do I try to back sweeten with something else ? Maybe someone has a idea for me. The only other thing I can add right now is I took a ph test and it is about a 4.