As @rachneli mentioned, it really depends on the curve of the particular test. For example, I scored a 173 on the January test, which if you give PowerScore's curve prediction any weight, would be around a -4.
Thanks, @"Matt Sorr"! I know it's anyone's best prediction, so maybe should've prefaced it that way. I second your line of reasoning, but I guess we'll just wait and see. Best of luck on your LSAT/apps!