Higher ketone levels do not mean you are going to lose more weight. Ketone levels being measured in the blood, urine, or breath are indicators of the amount of ketones circulating in the body or being expelled by the body and having more in the blood does not necessarily mean you are burning more body fat
As you become Keto adapted it is very common to see your ketone levels drop. This is because you body is becoming more efficient at utilizing ketones for fuel. Measuring ketones can be a useful tool to help you formulate your ketogenic diet. Strive for numberst to be above 0.5mmol, but do not assume more is better.