Hmmmm ... if the range is between 4 1/2" and 5 1/2", I would only expect it to ballance perfectly at or very near 5 1/2". If you put enough weight on it to ballance it perfectly at 4 1/2", it will track like an arrow ... kinda like training mode. It's going to be real sluggish, and the elevator won't have much authority. As you start shedding weight, it will move the CG back and give the elevator more authority. I would imagine they recommend you do this to break YOU into the plane
Check your CG around 5 1/4"- 5 1/2". If it's really close, add some weight till it ballances at 4 1/2" or so and see how she handles. 3D is a completely different type of flying than scale and sport. Sport flying relies mostly on speed to carry it through the maneuver, letting the wings do all the lifting. 3D takes it to the next level, letting the prop do the lifting, making your control surfaces more like thrust deflectors. I got a used Katana GS 70 and had to find out the hard way. I'm just now to the point where I can fly it around at just a little faster than a walk, but it takes alot of getting used to ...
Anyways, that's the reason for the range in CG, and why it won't ballance right at 4 1/2"
Best of luck
Also, I don't know what prop you're using, but I have an FS 70 surpass on mine, and an MAS 14x6 worked the best for me