Nice writeup but I still don't understand why you would remove the wastegate actuators and wire the gates open...
If you want to eliminate the turbos coming on sequentially, can't you just use a T on the actuator vacuum lines and attach them to the same source so they both come into boost at the same time with a boost controller? Or are the stock actuators set at different boost levels?
Wiring the gates open will cause the turbos to spin to ungodly speeds to reach desired boost levels instead of spooling up to the desired boost and letting the gates relieve exhaust pressure to control boost pressure.
Formerly 01' Onyx IS300 - Custom modified intake, HKS Drager II, Tokico Illuminas, Swift springs, TSW Trackstar 5 with Hankook Ventus V12 tires.