If you actually become familiar with your job instead of parses, you can see how close you are to the limit by how fluent your rotation is. It's all based on ilvl beyond that, so you're not actually increasing in skill. Just perceived skill because the number is going up with your gear upgrades.

Parses do not really give you good information. Knowing what you are doing does. If you need external metrics to measure your performance, maybe you should just practice your rotation better.