Been there...done that
Keep in mind a couple of things...weight loss in not linear and when you add in a high intensity workout, you WILL retain water at first as your muscles adjust to the new regimine. A workout such as 30DS, or any strength training for that matter, will create tiny tears in your muscles. Your body uses water to repair those muscles to make you stronger. That is why rest days are important. If you listen to Jillian's Podcast, she recommends 2 one one off, 2 on one off with workouts. Make sure you are getting your rest days!
Now...when you work out, make sure you drink extra water those days. Water helps rid your body of water weight. sound counter productive, but much when your body needs that extra water to repair muscles and finds it still has the same amount it used to, it is goign to retain out of fear it won't get enough. So, on exercise days, if you add a liter of water throughout the day, it will help.
After an intense workout, feed your muscles. A low calorie, low carb, high protein shake will do the trick. Or even 6-8 ounces of dairy, such as Greek yogurt. Personally, I am an EAS Carb AdvantEdge fan (vanilla only though...hate that chocolate!) Do that ideally RIGHT after a workout, but at least within the first 90 minutes post workout. Try to keep it between 100-150 calories if possible.
Now, check your BMR. I assume, since you know your caloric intake, you count calories...that is great! Don't however, go by the generic number all the websites and doctors give. Know your BMR, and check it often, as it changes with age, activity level, and weight.
Here's a
BMR calculator my baratric doctor helped me create. So far, it works (unless I am on predisone, but that is a different beast!) You are more than welcome to use it, just don't alter any formulas!
Now...consider this...the average human gains 10-15 pounds a year if they don't exercise or watch what they eat. In reverse, if we DO watch what we eat and exercise, we can lose .5 to 2 pounds a week on average...that means we can lose MUCH more than we gain...and MUCH faster! In 8 months you have lost 69 pounds...I'd say you are due for a plateau. And remember, a plateau is your metabolism resting, much like a two year old has to nap, so it can be ready to rock and roll once more.
I've also found, that when I stall on the scale, I NEVER stall on the tape measure. Take that habit up now, if you haven't already, measuring every 2 to 4 weeks.
You got this, I know you do!