In reply to Submit to Gravity:
Ideal fit is snug all round.
They should be comfortable in the 'skiing' position (i.e. flexed forward) but may not be if standing out of skis.
"forced' ankle lift is acceptable, ankle shouldn't lift just from flexing forward.
Chance of 4/5 or 5/5 fit from hire boots is trending towards zero I'm afraid unless you really do have Mr Average feet.