Replying to Best Bootfitter in CO+ Advice

I've been skiing a lot more this season than prior seasons and I need new boots. Right now I am 6' 175 pounds and have Atomic Hawx prime 90 boots that I've had for 4 seasons and don't like them at all. I don't feel secure or locked into my current boots and feel like I fold them over, but it's hard to say because I've never ridden properly fitted boots. I am an advanced skier or at least close to that and beginner/intermediate in the park making good progress. I ski 40% park and the rest all around the mountain. I do and will ski about 4 days a week through May at all the resorts within a couple of hours of Denver. I ride Vishnu keys and Rossignol blackops 98 if that matters.

Im looking to get the best fitting possible so please give suggestions for the best boot fitter in the area. Im in Lakewood so anywhere in Denver/Boulder is fine as well as summit county and winter park. It looks like the options are Larry's, A Racers Edge, or Larsons. Apparently the Golden boot mechanics location is not taking new customers and the Avon location is too far out of the way. I am interested in the K2 boa boots but I dont know if they fit my feet, so a K2 dealer is a plus.

Thoughts and suggestions about a recommended flex rating are welcome since I dont know what I want, like, or what to expect. Also are custom footbeds worth?

This season has been the best and is just getting started! Cant wait to get back out there after Christmas break.