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Buy the boot that fits best, although not perfect the best general shape will be the easiest to mold / work with.
Then you have two options,
have the boot manipulated to best fit your foot by the shop and buy custom footbeds.
Intuition liners. Simply the answer to everything (well most things).
their website is www.intuitionsports.com
They make the liners to Dalbellos and Full tilts, though the liners direct from intuition are better. You may know about them through your experience with dalbello. If you didn't heat mold the il moro liners there is no way they would have fit you.
Anyway, these liners expand to fit the boots shape and your foot, so it really is the tightest fit around. It may not solve all your problems but it will be a serious option for you to consider.
i use them and would never go back to a conventional liner. They reign supreme in their market.
You may still have a little heel lift or slight issues but these can be eased out using heel restraints/spacers/whatever is needed.
You also don't need a custom footbed with them as they form to your foot so you save money there, and if you buy them direct, they are not too pricey. (Euro terms, best footbed =70euro, intuition=90euro)
Sorry for the essay but it is something you should consider.
I am not affiliated to Intuition at all, i just believe in what they do.
You must go to a shop with a good bootfitter though.