I have to say I have removed the amal valve from my setup for various reasons.

I use a blitz boost control valve which uses dual solenoids to control boost. In my case, the boost I am running is close to the peak capacity of the turbo (similar to you JTech, 32psi peak, and 28psi hold). As such, it naturally has a kind of peak and hold characteristic.

The Boost controller uses the solenoids to do the job of the amal valve, but you program it yourself, rather than allowing the ecu to control it. It has four channels that can be mapped against rpm or speed.

It also has a boost match mode, which basically means you can set the desired level of boost, and it achieves it. This is a good deal more stable in varying conditions - prevents overboost in very cold climates.

JJ