SPOOND -
You want the AVC-R to go into Self Learning mode.
Start off by setting the start duty cycle to 35%. Do several (4 or 5) 3rd gear pulls from 3K rpm to redline. This will put the AVC-R in to Self Learning mode and the AVC-R will try to automatically adjust the duty cycle over the rpm band to maintain the .50 boost setting.
If 35% causes you to overshoot/undershoot your desired boost level of .50 by .0? then lower/raise the start duty cycle to accordingly -/+? from 35%. Repeat the Self Learning mode process.
Example: If you hit .55 with a start duty cycle of 35%, change your start duty cycle to 30% and repeat the Self Learning mode process.
***Be sure to watch you boost guage and if it overshoots your desired p.s.i. by more than a couple p.s.i., GET OFF THE GAS and lower the start duty cycle.***
You may have to do this process a few times to get it just right.
Hope this helps.
-Shawn