Zoomin' Pale Ale 20 Minute Boil Beer

I am thinking about brewing this one to have a pale ale on hand. I would brew it as the recipe is the first time. Looking for opinions.

Have you brewed this more than once. For your second or third brew did you add the LME at 15 minutes into the boil? Was the bitterness and hop flavor substantially different if you did?

For your second or third brew did you dry hop for extra aroma?