Yesterday it was an important day for me. I modified my boots so that i am now balanced on my skis. It was the last step but it worked for me. I added 4mm home made lifters under the toe of my boots. I know it is not for the faint at heart because it was possible to ruin my boots (new boots, never skied in them). What you could do is use home made plastic lifters (3, 4, 5 mm) and put them under the sole of your boots (depending on your needs) and use duct tape to hold them. Then, try the new setup.
Keep in mind that the ramp of your bindings (delta angle) is important. In my case, the new stance the boots put me in felt amazing but when i put the skis on they did not feel quite as good. I had 0 delta (toe and heel at the same height). I removed one of the lifters from under the toe of the binding and voila! i felt balanced. One of the benefits (we all know how important it is to have a balanced stance so we can ski our best!) is that if you are balanced, you are also using the skeletal strangth more and this will result in more energy at the end of the day.
IMO, the delta angle, ramp angle and the height of the lifter are interrelated. Forward lean can also play an important role in this setup.
In my case, the new lifter under the toe put me in a great stance but, as i said, it did not do well with the delta angle and the forward lean so i had to remove one of the lifters.
So, my recommendation is that you use home made lifters which are not very thick because you want to avoid toepiece problems and then play with different setups.
I know it is not for the faint at heart and probably most people don't do the things i did (i also dropped the heel of my bootboard, cut the lower and put the rivets (which came in the box) in). Was it worth it? Every second.