Two things-

1. Shape of the entire hairline from sideburn to temple to hairline back down the other side. This you have a lot of control over with your template making skills.

2. Proper ventilation. This you don't have much control over. The temple areas so far have been a weak point. The factories need to understand that these units are for men and that the temple/temple points/sideburns need to be ventilated with as much skill and care as the hairline.

I would recommend specifying EVERYTHING on your template including the direction you want the hair to go in each area. Also send a picture of what you want the end result to be.

If you do all of this and still don't get the results you are looking for you might have to get a ventilator here in the states to do some work on the front.