Are your feet swelling much? This sounds a bit weird but if your feet are cold and aircon'd you might have 20mm+ free space, but once they are hot and puffed up you might not have sufficient room in your boots?
Seems a little strange to me that high arches (if I'm correct in what you are saying you have) are allowing the foot to slide forward in your boot - would think that you would be have the best situation for foot placement in the boot! I have flat wide feet for example and need EE type boots as standard Euro fit boots pinch across me (small size 9) paddles. In a Euro standard fit I'm 9.5-10 in UK fit, EE or Wide sizing I'm a UK9. Do you find the front of your ankle complains at the end of the day?
I'd say the issue would be more the boot sizing and setup than anything else, try the aftermarket innersoles as there are a variety of these about that might help and also the lace locking suggestions. Also, go for a walk and try after a while to see if the issue is a swelling thing, certain boots that don't breathe or things like Gortex water resistant socks don't help here either.
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