It’s usually best to do full boils, except when considering hop contributions from a partial boil recipe. By doing a full boil w/ a partial boil recipe, you are going to overshoot your hop bitterness.
This is where a brewing program helps so you can adjust your boil amount and then adjust your hop amounts accordingly. Also, it’s late extract addition at 15min to flame out, which complicates it even more.
What dry yeast is it? US-05 says right on the package the directions but the manufacturer also has instructions for rehydrating the yeast on their website. If it’s a bigger beer or older pack of yeast rehydrating might be to your advantage before pitching into the wort, otherwise I wouldn’t worry about it and just sprinkle into the surface of the wort.
ETA: Here is the Fementis instructions for rehydrating if you go that route, just in case.
http://www.brewwithfermentis.com/tips-t ... hydration/