I remember this story. Not Perry, not Lensman. The rogue's were 80's. The number was supposed to represent how many others a PSI could control with his mind. The detective from Earth works with the PSI detective (who is a 40), and befriends the lowly 10, and her son, who is ranked as "Unknown" (as opposed to not yet ranked).
It turns out that the rogue 80's were the criminals, but they couldn't be stopped because they were the most powerful of the PSI's. In the end, the detectives are captured and held incommunicado by one of the rogues; I vaguely recall his name as Ranz (or maybe Kranz). In order to get help, the Earth detective "piggybacks" his mental message on top of the PSI detectives' mental powers. This worked because the PSI planet had no understanding of emotion. The Earth detective had feeling for the 10 and her son, and his piggy-back message contained these feelings. The rogue 80's were contemptuous of the emotional "slop" that the message contained, but it worked. The message got out and the 10 and the Unknown came to the rescue. Of course, they, by themselves, were no match for the 80. But they had a secret weapon. It was to attack the rogue with both physical attacks AND mental attacks. I remember the battle cry: "Let's all put our minds together and attack Ranz". While the lowly 10 and the PSI detective only comprise a "50", the physical attack of the Earth detective as well as the unimaginable power of the Unknown eventually win the day, and the 80 is mentally subdued. Finally, all the other 80 are taken into custody as well.
Unfortunately, I don't remember the name of the story. Sorry. But it was great reminiscing.
C