RACJ,
You are not bothering anyone.
Its just that the CG is one of the most important items to be addressed.
The people you have helping you do not seem to be steering you in the right direction.
Anytime you make repairs, especially to the tail of an airplane you need to check the CG, the tail is normally the farthest point away from the CG and a little added weight here has to be offset by considerably more weight on the nose.
This plane has been involved in a crash bad enough to break the tail feathers, chances are the wing incidence on the top wing is shifted too or maybe the horizontal stabilizer is not straight.
Look carefully at the cabanes that bolt into the fuselage and the top wing ... it is hard to describe what it should look like but there are many pictures in this thread for you to look at.
Once again your more experienced real life helpers should be guiding you through all of this. If your buddies are just fliers instead of builders please consult someone else in person that understands how to check this stuff.
Good luck to you.