You'll need to wait about 6-8 weeks from the time you pitched before making conclusions on recipe.
Definitely, a 1 week primary is part of what you are tasting - sour green apples is the harbinger. Low carb just means that you did not wait long enough (3 weeks) or that you have stored it below 70 degrees for the carb phase.
Now is the time to sit back, not worry, buy some commercial craft beers, and wait it out. And it is time to start more brew.