The load request system is safer as it will keep the max load at whatever the table says. So in summer it may take say 18psi to hit your load target of 9. But in winter with the colder temps it may only take 15psi to hit the target load of 9, either way your safeguard is that it will not exceed its target.
If you use the P part bins, the tune will only run off the tcv duty cycle map, so you have to figure out for your system, say 85% duty cycle equals 18psi on your car, it will always just hit that 18psi, so summer may see that 85% duty cycle give you 18 psi everytime, and hit it's load target of 9, however the denser Air of winter will see the 85% duty cycle still give you the 18 psi, but the load may go much higher like 10.5 or something, and it will knock badly when you least expect it.
The easiest way I found to slowly raise the boost was get a std 607rev5a bin, set it how you want like usual disable checks and stuff, then open your target load setpoint map, select a few cells in the max 75% TPS coloum (so wide open throttle) and add 5% to each load number.
This will increase your load, by 5% for wide open throttle only, so raising your boost at wide open throttle.
Select cells you want to increase, select multiply value, value 1.05 then enter. That will add 5% to the original number.
Load that tune up, see how it goes and if it pulls timing, then keep repeating this process until you hit the power and boost level you want at wide open throttle.
