Shafts ball flight and purring

I recently had a set of irons built. the club maker aligned all the spines in the set, and frequency matched them, as that is the only way he will build clubs.

he is currently sorting the shafts in hybrid to driver (I had good heads but the wrong flex shafts). he will spine align these too - it's not costing me any more.

I watched him when he was trying to find the spine in a potential driver shaft (not mine) - he reckons that he rejects up to 10% of some makes of shafts because they are so bad. (he's pretty scathing about a number of mainstream manufacturers)

off 22 I don't notice the difference, my swing isn't consistent enough, unless having less dispersion is the difference. I do know that any off-line shots are going to be down to me.