Replying to Any problems with boots being wide at ball of foot/metatarsal head?

Hey guys. I had burning at the balls of my feet after long ski days, so had a tech stretch them considerably at the metatarsal heads. It helped but my feet still burned a bit so I went to another fitter, bought some custom insoles and now I'm 100%. The 2nd fitter said the new last at the met heads were like 106mm. My feet are 99mm. In the shell I can fit a narrow finger between the shell and the big toe met head, but it's a squeeze. I know blowing out the toe box doesn't affect performance, but what about the ball of foot area? My ankles/heels/instep fit like plugs, btw. Thanks in advance!