I'd have to see that before I'd believe it. There was this drug awareness program that the Bureau of Prisons got saddled with by the Clinton administration. They ran this pilot, reluctantly, because of course plenty of conservatives favor "lock 'em up" with no interest in what happens after. Much to everyone's surprise, except the people who came up with the program, graduate recidivism rate fell almost to zero. So the AG, and congress, and whoever else had a horn to stick in, scrambled their brains for how to expand this program throughout the system.
What they came up with was a year off sentence for non-violent offenders who completed the program. The result was that graduate recidivism rate barely differed from baseline. Upon further review they figured out that if you split out the people who didn't get the year off but took the program anyway what was left actually had a higher recidivism rate than baseline.
End of the day I came away with a very low opinion of "incentivizing."