| I don't have experience with anything other than the Apexi AVC-R. What parameters are available to you? If you are limited to Gain only you can't really improve the response much. Making sure your wastegate actuators are working smoothly might help, if sticky they could cause oscillations. I don't know if a dual solenoid will do much for you unless the feedback controller takes advantage of it, but then again I don't understand the configuration of a dual solenoid.
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