Wastegate Actuator Question

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Blindly, I bought a HKS wastegate actuator under the advice of this guy at a local perormance shop. He covinced me that this was the source of my problems. What was happening was.... I bought a boost controller (an old greddy profec) and hooked it up and saw no increase in boost. So we put a tee in the vac line (and took the controller out) from the actuator to the ic line and saw a slight increase. So i bought a performance HKS wastegate actuator.... to my suprise, this didn't fix anything!(even with the boost controller). WTF! I'm running in the 5.5-7psi range. So is it my turbo? If so, Can i use the HKS wastegate actuator with an S15 turbo?

Any advice will help...
ps. I am using all the stock sr ic stuff.

Thanks, Mark