Richie, I feel like those boots might be too stiff for you and impeding your ability to get forward to make a better turn. The problem with extremely stiff boots is that as soon as you pressure the tongues, they push you back. It's hard to keep forward unless you have the proper technique. To be able to take advantage of those boots, you really need to be holding a very clean carve at much higher speeds than what you are skiing at.
Sounds like you are barely managing a silver on a fairly flat nastar course in a GS suit. judging from the videos, there's a lot of tail pushing on the turns. At this level, I feel like you would be able to improve your skiing much more if you switched to a softer boot (flex 110 or less regardless of your weight). I would say once you can make clean carves while free skiing with more dynamic turns, you should be able to consistently get gold on that nastar course. At that point, it makes sense to go back to the stiffer boot.
Also what skis are you on? At this point, a stiff race ski is anti-productive to learning how to carve. a softer flexing ski will be easier to bend and carve at lower speeds and introduce the feeling of the carve.