Hello to all Skymaster large Viperjetflyers

My friend Hans from Germany just did his maiden on his new large Viperjet from Skymasterjet.
Everything went well and he also did a nice landing.

In flight he had to trim full down elevator to get the model flying level. The Model did not feel tail heavy, did quit a smooth rotation.
Our solution would be that he might need some more weight in the nose []

Now our question for you:

What do you think he should change for is next flight?
What center of gravity are you guys flying?

Maybe some guys would post their personal set up?

Any help would be much appriciated!

Pics of the maiden will follow.

Cheers, Thomas