Because you're using the model as a trainer you'll be running with a CG location that is slightly ahead of the original racer.  Because of that you'll find that you end up with the elevator angled up from the up trim that the test pilot will add during the first flight.  To avoid the elevator always having this up angle you can add a degree of positive incidence to the wing's leading edge and a degree of negative incidence to the leading edge of the stabilizer.  Setting up the model for a 2 degree wing to tail difference like this will reduce or eliminate any up trim needed in the elevator.

One way or the other you'll end up with the trim in place.  It's either you build it in or you deflect the elevator.  In the end it adds up to the same thing.