extreme shot
Changing from carbons to aluminums, feathers to vanes, etc, doesn't usually affect accuracy but point of impact. There is a difference. Adjustments that change POI are easily corrected by moving sights. Accuracy is about repeatability. A 6" group centered around the bullseye, is much worse than a 1" group centered 5" to the left.

Being physically stronger won't affect your POI or accuracy, unless you gained so much muscle mass that your form was drastically altered.