If you are overboosting, then why do you want a boost controller? All they do is regulate the boost pressure going to the wastegate actuator, allowing you to boost higher. You can't "turn down" the boost pressure a turbo creates by adding a boost controller.
It sounds to me like maybe your wastegate is not opening either enough or at all. Is the vacuum line connected to the actuator? Is your downpipe interfering with the movement of the wastegate?
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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