Nacho, usually I do not recommend supplements to people, but may I suggest Tribulus Terrestris? Also, are you supplementing L-Arginine? Or as (I think kingpole) suggested, Cayenne Pepper? All of these things are generally accepted to increase vascularity/vasodialation. It can usually aide well with erections. The arginine helps me a lot. I took a short nap the other day and woke up with some kind of mast on my pelvis.
Keep up with those kegels! They are helping me achieve more massive WHA-POW! erections every day. EQ is one of my most prized possessions and I continue PE with the safety of having a massive boner, at least, while I'm increasing length/girth. Keeps me happy.
But hey man, so many things affect my cock these days! When I was in high school I had nothing to worry about. Now I have bills to pay, papers to write, girls to smack with some swag, places to go, hours to work... I know how it is! Although, if you're like me, generally a good remedy is -- I don't know when you work -- but I PE after work but before it's dark out. If there's light in the sky I can PE very well. If it's pitch black I'm antsy and would much rather be doing something else and can't quite the same monstrosity as I can earlier on. Unless I've just been freaking some girl out and it's about that time to take her home. After a few drinks, of course!
Anyway, hope this is helpful!