Most i have managed was a measly 10.8% . I think i could simplify the recipe though and make it a little stronger. With gluco i got to 11.5% but hardly worth it as it stripped all the body out. Carbing has been hit and miss so next time i have bottling yeast or i will keg it first.
I did a mini mash most of which ended up as unfermentables but the candi sugar etc, gave it the abv and it had plenty of body. 11.5% is a tidy result