Yes. As long as 1500 calories/day isn't too much calorie restriction for you, you are generally correct with that ballpark. If you want to eat other starchy foods, I find it best to use cronometer.com, so it does all the conversions for you (and choosing a 20:30:50 for a custom Macronutrient Ratio for Protein:Carbs:Fat). The goal is to eat the majority of your carbs as "safe starches". But, keep in mind that if you have carby foods that aren't "safe starches" (like a banana, honey, beets, etc.) you still count them towards your total carb consumption.
The rules are slightly different for weight loss on the Perfect Health Diet. You basically ignore the extra fats and still try to hit your protein and carb targets without much calorie restriction on those carb/protein targets.
http://perfecthealthdiet.com/2011/02/perfect-health-diet-weight-loss-version/
The section on weight loss is at the very back of the book, and is easy to miss. Try to read that section if you can.
Interestingly, it's extremely difficult for most people to lose the last 10 pounds on any diet. The
potato hack is probably the quickest way to lose the weight if you're up for a week of fun with quick results (not recommended for those with serious health issues).