i have a turbo e30 garrett t3 t04e 57 trim turbo greedy profect b boost controller

2 problems
it starts spooling around 5000 rpms anything i can do to this turbo to get it to spool sooner
and it will only boost to about 12lbs with the boost controller turned all the way up i know 12 is alot but not when it starts spooling before you shift
thanks for the help
frank