So then for a carbon arrow, being lighter and easier to spin compared to aluminums, will a 3 feather fletcing (4 inch feathers) done with an offset rather than an extreme helical achieve that balance, even using broadheads?
Probably. Much depends on the size and quality of the broadhead, not to mention how well arrow and the bow are tuned, how good your form is, etc. Only way to know for sure what is the least helical/offset or size you can use and get reliable results is by trial and error.