Before dumping money into manipulating the new Technicas (which I am sure is a fine boot in the abstract), I'd return them to the big box, suck it up and pay the tariff from a specialty shop with a professional fitter. For the extra investment you are getting a professional to analyze your feet, curate the boot wall and make intelligent selections for your feet and your skiing, fit the boots, manipulate the shell (as needed), build proper foot beds and most importantly, stand behind the fit and make adjustments along the way. That is all part of the package and well worth the additional cost (which is marginal when you consider the cost of adapting a poorly fit, "bargain" boot downstream). And do pay the extra $150 for foot beds - stock foot beds are garbage.
Pay retail for boots (I usually go for the pre-season sale when stock is at its highest and everyone is 20% off MSRP), but even now, just pay full retail (probably 10% off MSRP unless you are at the foot of a resort) and appreciate the full service experience. Skis, bindings and soft goods are what you buy on sale in March.
Also, if you are going to a proper fitter, don't even bother reading boot "reviews." Just let the fitter and your feet decide. Boot reviews are even more useless than ski reviews because fit is the overriding factor. All of the main manufacturers make a good quality product. Just get the best fit for you in the appropriate performance band - don't worry about whether or not the boot was on the cover of Ski Magazine or which pro or Epic member rides it. Totally irrelevant data.
Do boots right. Skis are fun, but boots are what actually matters (and makes skis fun). The only good advice here is a variant on the consensus - see a professional, in person. And as a byproduct you are supporting your local shop so they will be there for you in the future.
Good luck and have a fun season.