If you can handle that many carbs in a drink, that's your choice. There are drinks with zero carbs - all spirits, for example.
Alcohol affects the liver topping up blood glucose, so it is very possible that some of your readings are being skewed low. I see this effect very clearly, even on small amounts - eg one glass red wine.
Still means you're taking in carbs (as shown by the increase in your HbA1c "My last Hba1c (mmol/mol) was 80% up from 74% three months earlier") but your daily readings coming down might be not representative of your actual long-term position.