Need some advice on macro math

I've been tracking macros on a spreadsheet and realized recently that my formulas were wrong (calculating on grams instead of on calories), which means my fat was WAY higher than I thought. (I don't think this is a problem though, because I'm feeling fine and losing inches.)

So I checked the Keto FAQ to make sure my second shot at the formulas was right, and it says this:

The correct ratio for doing a strict ketogenic diet is 60% fat, 35% protein, and 5% carbs. This should be your number one goal for the keto diet, maintaining the correct ratio. An example of a ratio would be 100g fat, 100g protein, and 20g carbs.

When I do the math on 100g fat, 100g protein, 20g carbs I end up with 65% fat, 29% protein, and 6% carbs.

So is there flexibility in there so long as the carbs are low?

Is it a range of 60-65% for the fat and 30-35% for the protein?