and now for my 2 cents worth. I don't like analog trims too much because they are to easy to bump and knock off there position. digital trims can not be moved until you power up the transmitter so no accidental travelk adjustment in the car going to the field. Setting epa is the last thing to be done and should be very tiny since the best way to do it is to have the correct geometry and use the proper holes on the horns. this maintains your resolution on the servo for precise control. I do put about a 20 on the expo of the throttle to simulate a linear throttle response. ps throttle down trim full down engine stop. trim to idle. the last bits of travel on the carb in the wot position does just about nothing so just make sure the linkage does not stall up there.