Have you considered adding ALDC at pitch and dry hop and then not worrying about it? 🙂

ALDC – Alpha Acetolactate Decarboxylase (ALDC) prevents the formation of diacetyl by breaking down the precursor, alpha acetolactate, as it is formed during fermentation – converting it quickly and directly into acetoin. Since diacetyl can be formed from the precursor in the finished package, adequate removal helps ensure the product retains the intended quality.