Last month I got a pair of new Scarpa GEA RS alpine touring boots (women's) & had them fitted at a pro ski shop. From the get-go, the left boot has felt significantly tighter than the right boot, which feels just fine. I find this odd, because my left foot is actually a bit smaller than my right. The tightness is felt, initially, on the top of my foot (i.e. over the metatarsals), and basically makes me want to cut my foot off, despite having the buckles on the loosest rungs. Then, once I've switched the boot into walk mode and started skinning, I get a significant ache in a different spot - on the very outside of my left foot (metatarsals area), and radiating around that part of the foot, to include some aching in the arch. This ache typically goes away once I'm skinning up something steep, and then doesn't bother me again, until the very end of the day, when I feel a significant and lasting ache in this area (outside of mid-foot) which persists after I've taken the boot off.
I'm not sure if the issue is the boot or the linings, and have been hoping that with use, the issue would go away. I've toured about 8 days in these boots by now, and both the tightness and ache have persisted.