There is no auto-function for the EPR bugs modelled.  The EPR bug is just to remind you of what power is needed for whatever phase of flight you are in.  You should use it for takeoff, climb and cruise and also for go around power on your approach. In climb, the EPR needed will change quite a bit as you climb, but you will not have to move the throttles much as the EPR will rise on its own to some degree with a constant throttle setting as you climb.  The bug does not in any way set power -- you do that manually with the throttles.

The EPR gauge is my mod is modelled to show EPR as a function of corrected N1.  What you see on the gauge is just N1, so on the gauges you see, the relationship between N1 and EPR will vary with ram air temperature and thus with outside air temperature, altitude and Mach, all of which will change a lot over the course of a flight.  The end result is accurate. The Captain Sim epr gauge does not give meaningful values for any engine variant if that is what you are using.

My flight model will only perform properly with the air file and and all aircraft.cfg changes and to be able to fly realistically you also need to install the EPR gauge use the thrust charts. If you pick and choose bits of it will not function as intended or accurately.

If you want to model an advanced version I suppose you can change the thrust and weights, but you then need thrust setting charts for JT8D-17s or whatever it is your modelling and my EPR gauge and turbine tables in the air file may very well not give the desired results because they were made to model a different engine variant.

By the way Asanal has sent me an email indicating that he has discovered his trim problems are connected to his yoke trim calibration and possibly third party software he is using to load the aircraft. It's nothing to do my flight model modification.

When you turn off the autopilot, the aircraft should stay in trim.  As I stated in another thread, none of my modifications do anything to affect trim or the autopilot operation.  And you can use the MAC gauge included in the package to ensure you your weight distribution is within reason.