Sounds like you have a good routine. I don't know how much weight you are trying to lose but if you eat a high fat, med protein, low carb diet (50 grams or less until you reach desired weight) you will certainly lose weight. Also your speed should naturally increase. Try incorporating some sprints into your run/shuffle once or twice a week.
There's some great info on this site regarding diet and what foods to consume to lose weight and maintain a desired weight. We're all different and you will have to find what works best for you but remember it all starts with what we eat. What we eat leads the way to weight loss even more so than exercise. Good Luck, Peace...5x