Often you'll have to get very strict to lose those last few kilo/pounds.
The last few pounds is also relative to what each person thinks is the last few pounds. For some it's a flat stomach, for others it's shredded quads or a six pack.
Your nutrition should vary depending on what the last few pounds are to you. Your diet looks ok but not great. Since you have a realistic timeline I would eat like that for a month and see how your body reacts. If you're not losing the weight you want by September 1 try dropping the taters and replacing them more vegetables and some fruit.
"All I ask of food is that it doesn't harm me." ~Michael Palin