I may have wrongly assumed you were going to spend time shooting and tuning while at MacRotech. If you just dropped it off and he did the shooting it may be well tuned---for him. Every shooter grips the bow differently and this may be where the problem is.

Not only does a bow have to be tuned with the arrows it's going to shoot it also has to be tuned with the same person shooting it--meaning you.

How you grip a bow can make all the difference in the world as you may inducing torque, and if so the bow will never be consistant. Let's put it simply. If you are gripping the bow at all then you are shooting incorrectly.

I think if it were me having the same problem I would take the time and go back to the shop with all your equipment and have them watch you shoot, correcting any shooting flaws they see and then tune the bow with shooting it. That way both you and len will be able to see just what's going on and how to make the proper corrections.