Turbo spooling waaaaaay high!, need boost to come down......how?????? Options

[injection]

Hello doctors, get your surgical gloves on, because i need help.....
i have asked this question before with no solutions, so i will try again, maybe someone will pick up something i missed, hopefully!!!!!
basically, my 94 celica gt, which i swapped a st205 into, was up and running last may ( 2011 ), ever since then, my boost climbs to around 19-20psi, i have hit fuel cut twice, and smacked my face into the windshield the first time ( seatbelt safety ),
anyways, in order to stop hitting fuel cut, i have to let off around 5500-5700rpms, because im right on 18psi, and dont want to keep hitting fuel cut....cant be good
so heres what ive trouble shooted so far:
hooked air compressor up to wastegate with 15psi pressure....opened perfectly, quickly and smoothly
have an XS Power DP, checked to make sure the actuator clears the DP flange....it does
there is a line that comes off the wastegate and goes behind the bottom of the intake manifold to a sensor called a VSV valve???? i think its called, anyways, hoses are hooked to that and return up front, cant remember where the line goes up front though??
thats about it, kinda outta ideas

I was thinking of purchasing a manuel boost controller, but isnt that for turning up boost, or can you turn down boost as well ( explain please )
If that doesnt work....is there some sort of a bleeder type valve i can buy, to vent some pressure, or does that screw-up vaccum

Thanx, hope one or alot of you have an answer to my problem 6GC

[Smaay]

boost controller is not going to fix this. they are good for making more boost not less. the problem is with your down pipe the waste-gate cant bleed off enough to keep boost at a certain level. the best way to fix this is to machine out the holes that the wastegate open up.

[Rav4Race]

boost controller is not going to fix this. they are good for making more boost not less. the problem is with your down pipe the waste-gate cant bleed off enough to keep boost at a certain level. the best way to fix this is to machine out the holes that the wastegate open up.

With my Apexi Avc-R i can lower my boost and run more boost. I ran 0.4 bar on full throttle 7000 rpm on 3rd gear. When i increased it i ran 1.25 bar on 650 rpm. A good boost controller can do both, lower and increase your boost mate.