hey there, just to answer that question..as an instructor most of your time is logged as PIC. Remember the student is still under training and the flight is considered "dual" in the logbook.. Instruction is a fantastic way of getting those PIC hours to where you need them to be..hope that helps..
If you are fortunate enough to be able to do multi-engine instruction, then go for it. Your time will completely depend on demand at the time twin students = twin hours
Unfortunately dont have any information about APTRAC for you though.What I would recommend is that you thoroughly research all the schools that you are interested in before making the decision..your training is by far the most important part in your aviation career so choose wisely!