Arrows, on the other hand, take lots of work to get them right. Jumping ship and heading to the "carbon" side won't teach you anything about making or using arrows.
actually, in this case, it might 'teach' in terms of him knowing that all the variables of his shooting style are being done correctly.
if his grouping improves drastically, then it will prove that the wood arrows are not matched to his bow.
fire off three of the synthetic arrows followed up with a wooden one. study outcome.
perform rounds like this with each wooden arrow in your set.
the ones that have the closest flight to the synthetics are the ones you can possibly tune and experiment with. the others may end up being wall art; or matched to a different bow at a later date.