With that new info,it sounds like you just need to give it more time and the corals will come around.I would be more concerned if they were really light in color ,but it looks to me like your still dealing with some nutriant issues.Could be leaching from the rocks as the vodka pulls the levels down.If you have brought high levels down in 3 mos then i would keep on the path your going and it will pay off.But once the corals do start to color up,be carful with the vodka.