Adding weights elegantly
the spnner backplate being 1/2 inch forward of the cheek cowls... the engine's still further forward than any I've seen on the Avistar. The .46 FX is also heavier than the LA .40 that everyone else 've seen has used, and that's probably where the problem is.
If the CG is 3.25 inch back from the LE wth no ballast... fly it. Its not that far nose-heavy to be a problem, especially for training. The CG in the instructions is the aerobatic location. Up to 1 inch forward of that is acceptable for use as a trainer. Even if you are more advanced... getting used tothe pane with a forward CG, and mving it aft (slowly... 1/4 inch or less at a time) later won't be a bad idea.