a bleed valve will not bring on boost earlier as it simply bleeds the air away from the actuator line
an electronic boost controller will bring boost in earlier as most EBC's have a GAIN function, which holds the wastegate shut until the desired boost pressure is reached, rather than bleeding off the air...
you need to bleed air away from the actuator line which comes out the 'top' of your internal actuator bolted onto the turbo (a picture may be of greater assistance) and for an EBC you will normally need a reading from the plenum, so just put a t-piece in one of the lines running from the plenum (preferably NOT the fuel pressure line)
and make sure u have a boost guage before boosting the car, as the stock one is not accurate enough