Giro Factor? How well do they bed in?

So I bought some new Giro Factors since they're reduced at Evans - but after a few short rides, its clear that the volume is marginally too small. Not causing too much trouble on my left foot, but giving me a bit of pain on the outside of my right foot unfortunately.
Now this shouldn't be a problem if they are going to bed in and adjust to my feet -> but I'm concerned that maybe the tough Teijin upper won't budge so easily?
Can anyone with experience of the factors shed some light on the issue?
Now this shouldn't be a problem if they are going to bed in and adjust to my feet -> but I'm concerned that maybe the tough Teijin upper won't budge so easily?
Can anyone with experience of the factors shed some light on the issue?
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If they do not give and you have 44's I would be interested in buying them.