I wish I had great advice for you, but I don't. It sounds like you are already doing pretty well as of late.
My wife is similar in that, unless she has had a few glasses of wine, nothing is going to happen that night. I can't remember the last time we had sex completely sober. I know exactly where you are coming from on this and to be honest, I have been willing to accept this rather than fight it. I admire you for trying to resolve it.
Sorry I don't have anything more helpful, but I wanted to let you know I feel your pain.
PF
Me; 42, W; 43 M; 16 yrs S12, D9
3/13 - "I want to move to XYZ City (four hours away) and it might be without you, not sure" 5/13 - "Not sure I meant that"