Don't lose motivation!! Dieting was very difficult for me when I was in school, and since graduating last year I've been more focusing on weight loss, so I know where you're coming from!
It is fantastic that you haven't gained! Really it is. From the 1700 cals that you're eating are they mostly veggies/carbs/protein? I know sometimes that makes a difference too. I tend to lean more toward veggie/protein than carbs with my 1700 cals that seems to be the only way I lose weight, and my workout consists of me trying really hard to run/walk a mile a day.
I'm no expert with the weight loss since this is my first time really trying it without any tricks, but maybe try switching up foods or cals maybe? You can do this!!
09/15/2014---------- (173lbs)-started grad school!
01/08/2015 > 40-35-43 (179lbs)-new year, new me!
Lowest recorded weight as an adult -->160!