I haven't been able to get the stock stuff to control high boost, but it has mostly been a lack of tuning time, so I don't know if it is possible.
If you're looking for a better solenoid valve, the MAC 3-port boost solenoid valves from Ebay (like those sold by circuitse7en.net) can be controlled by the stock computer, and should be capable of controlling to those boost levels.
Reeves and I were messing around with increasing boost targets based on speed in the Logic Module, with a MAC 3-port valve instead of the stock solenoid, but we ran out of time before Drag Week last year to get the stock wastegate control tables dialed in.
So instead we created a 3-stage Manual Boost Controller setup with 2 MAC valves and 3 "G-valves" controlled by an external microcontroller to increase boost levels based on the vehicle speed.
DoubleD, if you are looking to build a manual boost controller that will hold 40+ psi, McMaster-Race-Carr has a high-pressure version of the standard "G-valve", part number 50265K23:
http://www.mcmaster.com/#50265k23/=10udhgx
The body and valve are different than the normal 48935K25 valve, but if you replace the spring and knurled end from the standard 48935K25 G-valve with the yellow spring and knurled end that comes with the 50265K23 valve, it should give you the high boost levels you're looking for as long as the spring in your wastegate can is strong enough to hold the gate shut at those boost levels. But go REAL light on the preload, with the yellow spring it doesn't take much to reach those boost levels.
But as mentioned above, I'm sure Jackson has something he has had good luck with at those boost levels if you want to go with a MBC.