The flex of Fischer's Progressor boots ranges from 100-120, these days 100 is pretty soft for a performance boot. Skiing them lightly buckled makes them even softer as the flex is usually measured with the buckles on their mid setting. There is no standard for flex measurement, so flex indexes vary from brand to brand. If ski boots are too soft they will not protect the ankle from damage in a forward fall. If you fall A over T very soft boot could flex past the limit that your ankles can flex without being damaged, before the bindings release. There were lots of ankle injuries when people skied in leather boots, these days they are very rare.
Dorsiflexion is the range of movement in your ankle joint, if you don't have enough you won't be able to flex the boots. Tightening a ski boot around a skinny leg makes it stiffer and reduces the range of flex as the cuff impacts the shell higher up on the curved bit just below the cuff. Before doing anything else read this article on ankle flex by Colin Martin http://www.solutions4feet.co.uk/cp6.php Don't discount that the boot might be too big, it may be the right length and width but if it's too big around your ankle your shin might not be in proper contact with the tongue, which makes the boots harder to flex. Unless you had to have extensive work done on them 4 hours is an awfully long time for a recreational ski boot fitting, did you by any chance get them from S&R or EB?
