Wow! Great job, congrats on your hard work so far, I had a similar regime as you and have similar results has you, I like you used to wiegh 195 lbs and lost 20 lbs slowly but atleast I lost it, but I hit a brick wall at around 175 and couldn't lose anymore.
So what I did to help me reach my goal of 160, I totally switched up my workout to give my body a shock to something it wasn't used to which helped me lose some more pounds like 5 or more not really to sure.
Also I switched up my diet, like you I was cutting calories to around 1500 to 1700 a day, but what I nelgecting to include was what food(s) I needed to eat into to promote what I wanted my body to do to achieve the resluts I wanted. One thing I did was actually take in more calories than I was eating, believe it or not, eating more food with the right healthy fats (ie; nuts, fish,etc) have certain nutrients that help your body preform certian functions like speed up the metabolism and force the body to burn fuel (like stored fat), these fats help produce more testosterone which is what speeds up the metabolism which is paramount for you because your a woman and your body doesn't really produce enough testosterone to promote wieght loss. Also natural sugars like fruits also help the "fuel" burning in the body and veggies give the energy to do so.
As far the protein your doing good, your taking in 1/3 of protein for each pound that your wiegh, but try to switching to natural protein sources, if you want to look leaner, natural protein in red meat may help you get leaner, but you don't have to eat beef in every meal, instead try a balanced diet to get certain proteins throughout the day (eggs, dairy, veggies, and meat).
Also keep working with wieghts, your a woman and your body doesn't produce testosterone like we do, so you won't bulk up like we do unless your hitting it very hard, remember to look leaner do more reps of less wieght.
I did this and lost all the wieght I wanted to and I am currently 5 lbs UNDER my goal weight, but it was a long process for me (approx 8-9 months). Men safely can lose about 1% of body a week and woman can lose half of that safely. So stay determined, it's a slow process but it does work.
Give it a shot, it might help! G'luck