I get practically zero boost in 1st gear, but the other gears are normal...
Could I have a problem with the turbo control solenoid?
I read this following paragraph on a website about troubleshooting boost problems...
it sounds similar but I have a problem with primary and secondary in first gear...
I have a profec B, but still am getting 10-8-10 in 2,3,4 gears with all the ***** turned to min values...(other mods in sig)
""Turbo Control Solenoid(s) / Actuator

The Turbo Control Solenoid / Actuator is one of the more complicated actuators as it requires both vacuum and pressure to operate properly. This actuator is controlled by two solenoids, (both are wired together to the one ECU output) one solenoid applies pressure to one side of the actuator and the other applies vacuum to the other side of the actuator. With pressure on one side and a vacuum on the other side of the actuator, the speed of the actuator is improved. A typical problem is loss of Secondary boost in 1st or 2nd gear at 4,500 RPM, but reliable operation in other gears. This points to one side of the Turbo Control Actuator not getting it's pressure/vacuum, so it will still operate but not quickly enough.
No vacuum to one side of the Turbo Control Solenoid / Actuator is a common failure. This is typically caused by the one-way valve that supplies vacuum to the Turbo Control Solenoid / Actuator through the Vacuum Chamber. The one-way valve will leak, allowing manifold pressure to leak into the vacuum while under boost"

 

from what your saying it does seem like you have a problem with one of your actuators.
These solenoid/actuators are pretty darn expensive at mazda, about $150.
Post a wanttobuy add in the parts for sale section. you'll be surprise to know that a lot of people are selling theirs because they went non seq. or single turbo.

Nathan

 

good luck and keep everyone posted. Its always good to read about how one fixed their boost leak. that will help all of us out even more with troubleshooting.

Nathan