I've noticed similar things 007, it's still a matter of putting into action when having sex though.
So anyway I had a fair amount of sex this weekend, some of which was I under the influence of alcohol so I'll disregard that. I'll talk about Friday..... So Friday lunch time I did my usual enlargement routine (JP's routine with some added bits). In the afternoon I did a short Edging/Masturbation routine, held back my ejaculation a few times then got a bit excited and shot my load.

About an hour later my girl friend arrived and we had sex, I really tried to concentrate on my breathing and relaxing this time and it worked

I didn't last forever but I lasted a lot longer than I usually did. In fact I think I could of lasted even longer, I felt I had A LOT more control but was so happy I lasted that long I decided I'd shoot my load lol.
Now like I said Saturday evening I was drunk so I won't count that, however Saturday morning when I was hungover I had sex and lasted seconds. I assume this was due to the alcohol?
I'll keep on doing my routines and report back any improvement.