Remember that these clone recipes aren't going to be spot on either. I like your recipe. I think what you are missing is a bittering charge at 60 minutes. You basically have all flavor additions at 15 and 0. I've never done a 1 gallon batch so I'm not sure off my head of the amount if a hop you would need. You have Columbus and chinook on hand now, right? Columbus will give you a "dank" bitterness while chinook will be much more "piney." Pick one and do a light 60 min charge. A whole oz at 15 minutes seems steep. That's where you gained all of your IBUs. Cut that down significantly to work with your bittering unit. I'd shoot for 30-40 IBUs. I half oz or so at 0 and dry hop would be nice too.