well, 1st check hydrometer with water to see if it is accurate, mine reads about 0.004 too high. it looks like your reading is about 1.004-1.006. as far as i know possible causes for low FG could be too low of a mash temp or too high temps for fermentation. anyone with more experience /knowledge...
brewed this about a week ago, also used a hop spider. the hops smelled fantastic...until they got thrown into the boil then the aroma was not as present. now after a week in my ferm chamber i can smell that beautiful hop aroma when i open the lid..cant wait til its ready to drink.