I'm selling these 4 year old boots as the fit on me, sadly, just isn't right. They slip at the heel when I'm ice climbing but have been fine when walking or on mixed. Because of the heel slip I'm selling them on. Whoever buys them is getting a real bargain!
They have a few light scuffs commensurate with their age (they have been used lightly each season) but have loads of grip on the sole and the leather is in almost perfect condition. They have been religiously cleaned and re-waterproofed after every outing so are in ace condition.
Just a thought but I've had a similar issue in the past and found that using a good pair of insoles (Superfeet Green for example) solved it for me, presumably because they reduce the volume available in the boot. Might be worth a go?