Having had surgery for Hypospadias when I was younger - which didn't make any measurable difference and I wouldn't have had if I'd been given a choice in the matter - I would advise against doing anything to your penis, surgical or otherwise, so long as you're not in pain and it's functioning reasonably well. Obviously if it's causing you discomfort or you're having trouble peeing or cumming it would be wise to discuss matters which your doctor and be guided by his advice. However I'm sceptical about PE and, in the light of my own experience, I'd advise strongly against surgery unless it's causing you significant problems.