You know I want to try this too now that I have a better skimmer. Theres lots of info on it online heres some..Vodka Dosing by 'Genetics' and 'Stony_Corals' - Reefkeeping.com I plan on starting with very little and cross my fingers. Also I might add have you ensured your not overfeeding, or have enough circ., or high phosphate? You might want to look into those thing prior to going the vodka route imho.
One other thing you might want to read The Old Becomes New, Yet Again: Sandbeds and Vodka - Part II by Eric Borneman - Reefkeeping.com it gives a different opinion on vodka dosing.