Background: I've had problems with boots since day 1 starting out with being fitted in a boot that was too large. I am currently in a pair of expensive boots that aren't quite right for me and I don't want to mess up on the next pair I get. So far the boot that feels perfect in the store is the Salomon X3 130. My favorite part about riding is ripping groomers and I comfortably skied at 65 mpg on my gps yesterday. I can turn backwards and initiate turns backwards on green runs but am not completely comfortable and usually resort to "pizza" when I get going too fast( again this is backwards). I was told by someone I trust that has taken many lessons and has a racing background ( he has not seen me ski) that I may be overestimating my ability and that I am in a boot that is too stiff. He believes this has caused me to pick up bad habits and my technique is part of the reason for my foot pain. I have been tightening my buckles all the way down, I just have more fun when my skis are more responsive but again I'm not sure if its my technique or boot.
Main Question: I want to purchase the Salomon X3 130 but I am worried it is too stiff now, but it is the only boot in the store that holds my ankle and does not cause a pressure point on my shin (I have tried on every pair in the store). If I get these "race" boots how would that cause my technique to suffer on groomers? When learning spins and powder will a stiff boot cause me to develop bad habits? Would it make me more prone to injury? Should I buy a softer boot that doesn't fit as well with an expectation that I will be upgrading in a year or two when my skills have developed?
Thanks for your input and if you have and questions to narrow down my skill level I will answer as honestly as possible. I am just starting to get REALLY passionate about this sport but right now my boot situation is driving me away. I really don't want to switch to snowboarding but it looks like the direction I may be headed. Also, any recommendations for a private instructor in AZ that actually knows his/her stuff would be greatly appreciated.
tl;dr What habits will a "race" boot cause a beginner/intermediate skier to develop? Would a race boot make one more prone to injury/bad habits when learning to ski powder/park?