cooker, you're right. dunno if that's a #10 plate or not. the gover arm moves in relation to RPM, not boost or anything. so, if you floor it from a dead stop (with an auto, or go reaaaally slow with a manual), then the arm will go under the plate. there's full fueling, been there, had that many times. if the arm is low, say on the plate pictured..... well, rpms will raise the arm as you head down the road (not under immediate WOT conditions). now it's not running the right amount of fuel per rpm/boost (may be really smokey and/or lack power). adjust the arm up a little bit where's it's suppose to be set, and then the fueling curve is better suited for the truck.
k5ip, i don't know what the shape of the #6 plate is like, i'm guessing that it cuts back the fuel on the top end, hence. . "not compatible" with the gsk?