mine is an external setup racegate (two ports) and i was having isssues , had to get a light spring to use the two step feature but had stability issues keeping boost during run , it would surge back and forth about 5psi range at about 1.2 second intervals
so far it appears the expansion of rubber lines mades it difficult to controll boost since the control doesnt get a fast accurate signal of where the boost actually is
eliminate as much rubber tubing as you can from the map sensor, if you can run in plastic vac line .the larger the better.
same goes for the solenoids ,keep lines short as possible
i mounted my solenoids to the injector rail and plumbed all lines with 5/16" steel tubing with short peices of 1/4" rubber hose on ends to connect,