I'm probably not best placed to advise as I have had to give up alcohol completely (been sober for seven months now). It is only wine that I had a 'thing' about, if that makes sense, I have drunk spirits and beer/cider in the past but would never bother - indeed DH has had spirits in the house whilst I've been recovering and I've never been tempted.
I don't think you're drinking enough to worry about a physical withdrawal problem, although I didn't suffer a withdrawal (somewhat to my GP's astonishment).
My boss is similar to you in that he knows he's drinking more than is healthy but can't find a good way to cut down, even though, as he charmingly points out, he doesn't want to 'end up like me'. In fairness I don't want him - or anyone - to end up like me!
Lots of people do an alcohol-free January, which I think can be a good way to explore the benefits of not drinking - my bro says he always loses about half a stone - but isn't as daunting as giving up all together. One thing you could then use the time for is looking at your triggers. I had a very strong one at first which was: get home from work, first thing I did was pour a glass of wine. Didn't matter if the day was bad or not, it was always the first thing. It's ritual and habit.
The other thing a period off booze might give you is a mood improver. I always thought this was bollocks, even though I knew alcohol is a depressant. I figured my life was so stressful I needed wine to make it okay. Wrong. Overall I have found life a great deal less stressful since I stopped drinking.
The other key thing I think is to make it 'real' by admitting it in real life. I know you don't want to go to AA (I don't go) as you don't want to give up alcohol completely, which is reasonable. But what about going to see your GP? At least he/she could take some blood and refer you as delusions suggests. No-one else needs to know, and your GP can't make you stop drinking; indeed I think he/she will probably try and be supportive for as long as possible (this is the impression I get from my GP although he's never said as much).
So. My feeling is that, like for my boss, cutting down is not for you, rather cutting out and then building slowly back up as and when. BUT that is based on my own experiences as a heavy drinker and I generally try not to evangelise, as nobody needs the 'soberer-than-thou' routine pushed at them against their will.
Good luck with whatever you decide to do.