I'm sorry but in this case that just doesn't work. The big problem is the choice of equipment he started out with and it's limited capabilities. Because of the placement of the servos in the fuselage sides being off center to the horns the geometry of each side is completely different and that will result in a different range of motion for each side with a given input, sorry but that's a fact. Now you can fiddle with it a bit and get the end points to come out the some, the travel through the arc will differ and that means at part throw the halves will be out of sync with each other. Unfortunately this is the worse situation because these planes spend most of their flight time in low rate, or using only a small part of the full travel which is where the mismatch will be.

Like I said earlier if you make a set of pointers and check this I think you'll be surprised. I spent a LOT of time trying different set-ups on quite a few models and found that the worst possible configuration was one were the geometry was different from on one side versus the other.

Bear in mind that on most planes that a trim adustment nade on the maiden flight tom get the plane flying straight might only be one or two clicks of up or down elevator. Typically that adjustmend is 1-2 degrees which is not much but it gets the plane flying striaght and that's a good thing. Now imagine how poorly a model flies when the elevator halves have a mismatch of 2-5 degrees which is very likely if steps are not taken to ensure that these tracking of the halves match each other as closely as possible.

If your going to shell out 1.5 to 2K for a model why not tkae the time to set it up right?