I suggest that you put the foot back in a comfortable position inside the boot. (Do you have a Footbed? Custom or otherwise?) (Have you adjusted the cuff with the footbed under the foot, to match the angle of the lower leg?)Just for the sake of discussion internal canting can work in some specific situations, however it is not a common practice around the world. The boot fitting community is split at about 5% for internal canting and 95% against. Dont be fooled by experts on this site pushing this stuff(they are selling you a product not a concept) As an example this concept is generally condemmed as inappropriate for performance enhancement in ski racing circles.
One of the basic tenets of good bootfitting is to "DO NO HARM" Anytime you make a modification that causes pain.....you should stop doing that!
For on snow experimentation of alignment, you can try over-canting or under canting your boots using duct tape or a credit card, between the boot sole and the binding interfaces. 6 strips of duct tape is 1.5 degrees.
Using 6 strips of duct tape, try skiing 1 run with the duct tape on the inside edge of the binding, and then reverse the tape to the outside edge of the binding and make one run. This should be enough skiing to figure out which feels better. Once you discover what direction you need to go, you can refine the amount of cant for best performance. Do not ski for extended periods of time with duct tape between your binding and the boot sole. The binding will not release properly with this foreign material.
Groomed, moderate terrain, is ok to begin this process, however you ultimately want to "test" your set-up on a variety of turn shapes, terrain, and snow conditions to find the best universal alignment set-up.
Once you know your final need of sole cant, it can be fixed permanently by planing the boot sole, or attaching canted sole plates to the bottom of the boot, or cant strips installed under your bindings.
PS: If you no longer need that credit card, could you send it my way. The wife and I were thinking about a vacation in Italy this spring.