I don't believe you on the 99% part. If you add up all the bad stuff (including hangovers and the times you overeat because of drinking) I bet it adds up to more than 1%...
I reckon you are where I was about maybe 5 years ago. I didn't have many negative consequences but I knew it must be a problem because of the sheer amount I drank. Nevertheless, when I started getting uncontrollable anxiety and nerve damage from my drinking it hit me like a train. There came a point when I desperately needed to stop but found I couldn't.
You're a smart guy, maybe you should just look at this as something you should be able to do. If drinking isn't a problem for you 99% of the time then it should be no bother giving it up for say, a year? It may be fun but that doesn't mean you have to do it. Stop rationalising why you should drink and just give it up for the hell of it. Give it up before you have to x