Mash hopping won't give you aroma. If you want though, you can try something unconventional... mash hop, first wort hop, and bitter with the same 1.0 to 1.5 oz. or so of hops throughout...Never discard them. I tried this twice for my smooth hoppy beers, and it worked well. For a smooth APA with a ton of aroma, the only other additions you need to add would be a bunch of flameout and dryhop additions. Nothing between 59-1 min. I found this method to work rather well for your goal.