amel valve is proberly goosed as it acts as a restrictor for the boost so if it isnt working it will boost to what ever the actuator rod is set at

take off the actuator rod and unscrew it 1 full turn which will then be aprox 2psi less

dont forget if your running more boost it will need more fuel and you said it was set up on 8 psi, so if you want to keep the new boost limit you will need to get it set up again