I am shooting 30 inch carbon shafts with 3, 4 inch vanes fletched at 4 degrees. Is this enough to stabilize 125 grain muzzy broadheads? Thank you.

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Looks good to me. I shoot a similar setup with 4" vanes at 4 degree offset but with slightly different fixed blade head. Flys fine for me. Be sure to tune with broadheads, however, as any problems should show up when you put on the big Muzzys. Also, spin test your arrows to make certain that the broadheads are in alignment with the arrow shaft. Good luck!