good feather guidance covers up any sins of the shaft. you can take that to the bank.
with a NEW carbon brand/type/spine, i bare shaft for flight before fletching. once i know how the bare shaft flies, having been cut to my arrow length and with my selected point weight, i'm good to go therein with that particular brand/type/spine of carbon shafting. carbons are extremely consistent and their dynamic spine is very different from their static spine. there COULD be some ROTATIONAL static spine differences with carbons - i've done the random spine checking and found that can be true - but i've found that none of that matters at all since the dynamic spine takes over and they all fly extremely consistently.
so, bare shaft a new kinda carbon, dial it in for straight flight, yer good to go with feather fletchings. since using ad trads and beman ics 500's for the last 5 or 6 years, i've yet had a need to re-test either for bare shaft flight ... but i did so last week with the bemans and absolutely no change in great bare shaft flight.
NOW with ALL woodies, i always spine each one on an ace 107 first, and then bare shaft each one for flight. yep, every one and every time. and then they get fletched or become tomato stakes - woodies can be THAT inconsistent. :D
all bare shafting starts at no more than 10 yards and proceeds to 20 yards. they should all fly like darts on rails, as if they were fletched. aside from the physical attributes of the shaft, the rest is up to the shooter's form. always consider shooting form as part of any arrow flight testing - it's there whether or not we like it, or even admit to it.