Level scaling? No, level scaling is shitty and boring enough in video games. Just leave the poor bears alone along with the areas that characters have now surpassed and focus on the appropriate progression for what lays in front not the back. 

Also that doesn't explain a thing at all. We're asking what power or proficiency do these numbers mean at various ranges do. Here's an example from Mutants & Masterminds's trait ratings
[list]
[*]–5 Completely inept or disabled[/*]
[*]–4 Weak; infant[/*]
[*]–3 Younger child[/*]
[*]–2 Child, elderly, impaired[/*]
[*]–1 Below average; teenager[/*]
[*]0 Average adult[/*]
[*]1 Above average[/*]
[*]2 Well above average[/*]
[*]3 Gifted[/*]
[*]4 Highly gifted[/*]
[*]5 Best in a nation[/*]
[*]6 One of the best in the world[/*]
[*]7 Best ever; peak of human achievement[/*]
[*]8 Low superhuman[/*]
[*]10 Moderate superhuman[/*]
[*]13 High superhuman[/*]
[*]15 Very high superhuman[/*]
[*]20 Cosmic[/*]
[/list]