It looks to me like you have not yet hit "a wall". You have lost 8 pounds in just over a month-and that is a good and steady rate.
What I suspect is that the first couple weeks the weight was coming off faster-and now it has slowed down a touch and you are maybe getting worried?
When you first start losing weight it tends to come off a little quicker for various reasons-one being that the heavier your weight is, the more calories your body burns naturally to maintain that weight-so most people find that when they get close to goal (the last 5-20 pounds) that the weight comes off slower and slower.
You are doing everything just fine it seems-the only thing I can suggest is not to "plan" your weight loss so much by expecting/planning to lose 2 pounds a week. Your body has a lot of things to adjust to when you lose weight, because everything in the body is connected.
A similar scenario is when you think about why you gain 20-40 pounds when you are having a 7 pound baby...there are many changes in blood volume, fat stores your body produces for breastfeeding, extra water your body is carrying-even your heart and lungs shift place in your chest cavity!
Your body has to adjust things to your weight loss-so you may do things evenly-keep in your calorie range, exercise faithfully-and you may lose 2 pounds this week, and 1/2 a pound the next. Your body will lose the weight-but you really cannot "calculate" how fast it is going to do it in.
I would not say that you have hit a wall or plateau until your weight loss has pretty much stopped (100% on plan and with continuous exercise) for about a month. Even if you are only losing 1 pound a month-you are still losing-so I wouldn't worry. The last 5 pounds for some people can slow down to 1/2 a pound a month. Every body is different.
My advice is to keep on plan...keep on exercising-and only weigh yourself at the MOST once a week. Heck-stay off it for 2 or 3...and you may be pleasantly surprised. When your losses slow down a little-it can be frustrating to be weighing in twice a week and not seeing much change.
2 pounds a week IS a healthy weight loss...but most only lose that much in the first phase of their weight loss-not that fast as they get nearer to their goal.
Just be patient...the weight will come off. You may not lose the 10+ pounds that you want to in 5 1/2 weeks...but you may lose 3-5 in that time. You are still going in the right direction, and will look better, and feel better. Just keep it up.