The CG and the surface throws are best found out from how the airplane flies. What the mfg suggests is nothing more than a very safe starting point. The mfg almost always considers a couple of things when publishing the numbers on an airplane. The manufacturing process is very apt to create as many tail heavy models as it creates nose heavy ones. So the throws need to take that into consideration. And then, the mfg almost always opts for very, very conservative CG locations. It's safer for him and safer for the percentage of modelers who really bought too much model this time around.

You always want to consider the written word for the model's maiden flight, but from then on, let the airplane tell you what it wants. It's actually very safe and easy to do.

You know right now how the airplane flies. And it's telling you that the CG is more than safe. On models that size, moving the CG can cover a couple of inches sometimes and still have a model that is perfectly stable. About all that happens is that the elevator gets more and more effective as you move the CG back. So you remember that and watch out for it. In your case, you want more effect, so you're going to win in two ways.

One other suggestion. Forget about measuring to the thousands of an inch. You've got the wrong idea about CGs. They aren't that critical. Nor is that accuracy of any value at all.

If your model is safe to fly and you're comfortable with it's response the way you've got it trimmed, moving the CG a half inch won't suddenly make it dangerously sensitive. Matter of fact, most inexperienced flyers wouldn't notice the difference.