the side port of the wastegate has a pressure leak past the valve guide, this leak changes with temperature.
so anything that is a straight bleeder will be inconsistent from day to day. (the stock solenoid falls into this category)
figure 1 looks to be a ball-and-spring "controller" (its really just an "adjuster"), these work ok in this kind of situation, they tolerate downstream leaks.
figure 2 looks to be a pressure regulator being used in-line, most likely as a bleeder, I would not do things this way, if you have a regulator, set it up like figure 3.
Bob