I am brewing a Milk Stout that is in my primary fermenter. Fermentation was done at 68-72%. OG was 1.058 (expected 1.064). After 2 weeks, the fermentation is not as low as desired; it is at 1.026, but I was hoping for 1.022. My target abv is 5.5%, but I would be happy with 5.00% or 4.75%...