I read a good chunk of these, though I didn't get all the way through.
It appears the OP has a firm grasp on nutrition in the first place and already does plenty of HIIT. If your nutrition is perfect aside from beer... the only answer is the unthinkable... cut your beer intake.
You could drop some of your healthier calories, but you've probably planned those perfectly. I don't think you'd want much more cardio than the HIIT sessions you're already partaking based on your goals.
I'm 31 years old and in the Army. I normally run three times a week, lift four mornings a week at 0430 before PT formation, and do some type of crazy muscle failure twice a week with my platoon. If I don't eat anything crazy, I maintain around 230 lbs @ 6'1", which is "overweight" by Army standards, though I'm far below the body fat % allowed, so I'm golden.
I average a beer or so a day during the week, and sometimes I'll have three or four on a Friday or Saturday - at most six if it's an all-day affair. I never drink to intoxication, but the calories I take in will not be good when I get out of the Army in three months.
I'm a former fat kid, weighing in at over 300lbs when I was in my early 20's. I quit drinking beer (which means I quit drinking a 12 pack every other day) and I dropped 20 pounds in almost no time without changing anything else. Empty calories are killer!
I'm interested to know the resolution you come to.