I don't know what it's showing in the image, but I've tried it both ways (having T-piece connected; as well as running straight from cooler piping to actuator)
The ViPEC ECU can utilise the factory boost solenoid to bleed boost, acting as an electronic controller. This is why it was originally still hooked up. Even though it was connected, the ECU was not utilising it to control boost.
Unless I am mistaken, as well as a LOT of people before me, you cannot INCREASE pressure between the cooler piping and the actuator with the stock boost solenoid. If the solenoid is my issue, then not only is it doing something it should in no way possible be able to do, but it would have been resolved when I ran a single uninterrupted hose from the nipple on my cooler piping directly to the actuator as it had been completely removed from the system.
I don't mean to sound like I'm ranting, or fishing for the answer I want, but I feel as though I'm a student educating my teacher a little.
If there is any leak at all between the boost source (intercooler piping) and the actuator, be it a split in the hose, bleed valve, or the stock solenoid doing it's job, this will result in an INCREASE IN BOOST. The only way I could decrease my boost below the minimum, would be to plumb in some kind of pump before the actuator.