Ok this should help get rid of any confusion.
Set:- This is the max duty cycle the solenoid will run.
Think of it as how much air it will bleed off.
e.g. 20% will bleed of approx 20% of the pressureised air.
Gain:- This is how fast the boost controller will allow the solinoid to go from o% duty to the set duty cycle. This seting will bring the turbo on faster or slower etc.
SetGain:- The boost controller will bleed 100% air off till the set pressure and then just run the setting of set and gain (1st 2 points).
Ok The best way to set up the controller is to turn setgain to zero to start with.
Then adjust the set to your desired level of duty cycle. 20% should add approx 20% more boost than the set spring on your waste gate actuator.
Now start at 35% gain and go for a blat in third (on the highway). No all you need to do is keep dropping the gain till the boost stats to spike and back it off a little.
(too lower gain setting and the boost will spike, Too higher gain and the boost will come on to slow and/not reach the correct boost level.)
Once you get your boost comming on hard and staying constant just increase the setgain now untill it starts to spike and then just back it off.
Hope this helps and good luck.
Oh yeah, Also make sure your stock boost control solenoid is disconnected from the system.