I'm curious, did you check your final alcohol content with the hydrometer?
I've used to do a lot of homemade wines, and I remember most yeasts maxing out in the 13-16% range.
For those interested in home wine-making, I recommend starting with a kit wine / grape juice concentrate. After that, pick up the book "Making wild wines and meads" for some excellent ideas. A dry cherry wine has always been my favorite.