You can always try tweaking the vacuum thing on the throttle arm of the IP. That was their way to monitor the load demand on the engine since the diesel did not have vacuum.
Yes, I have thought about that. Funny thing is, the arm isn't at rest in the same position. On my truck, it points straight up. On the RV, its at an angle toward the firewall. The screw on the truck is barely in and on the RV its about half way, but due to how far back the arm is, it makes sense for the screw to need to be in so much, so the throttle arm can contact it.
I guess I can try to take a picture if I can get my phone in there to the side.