Hope,
We all have had that feeling, and it will pass.  Just keep following that golden rule and try to drink as slow as possible with those first 3 drinks (set a timer on your phone for 30-45 minutes if need be).  
My theory is our brain is not accepting that "ah moment" isn't going to come, so it tricks us into drinking more (I am not a scientist or a health professional just a drunk).  It has happened to just about everyone after the honeymoon phase.
Hope1972 wrote:
I've taken my Nal an hour before (at least)
Does that mean at times it has been longer than an hour?  If not, the golden rule is the most important part of this.  Your brain is wanting that "ah moment" and will do anything to get it.  If you are not waiting that entire 60 minutes your brain could be feeling a little of those endorphins, just enough to delay in your progress.
Do you think you are ready for an AF day?
Jaba