I just finished my welches white grape peach and it's the best wine i've made yet. Other than the extreamly fast ferment/clearing time (10 days to ferment, two weeks to totally clear) It produces a pretty good abv of about 7.5%. You could bump this up with dextrose, but it would take longer to age. (this is my next project.) There must be some unfermentables in the concentrate, because it fermented dry, but retained a lot of the flavor. The peach adds a lot of body that my other country wines lacked. All in all, I will be making a LOT of this in the very near future. The best part is if you're tastes aren't too particular, you could drink this right out of the carboy once it's cleared and its still a great drink. I think the body of this wine is so good, i'll blend it with some wines that are weak in body.
let us know how yours turns out!