I want to make it clear that you are a higher level skater than me. That said, I can't imagine that a boot should crease right of the box.
I sometimes work at a rink, handing out rental skates. Immediate creasing is what happens with rental boots when they are substantially oversized, or the laces aren't tied tight enough. Which tends to destroy the boots in a few minutes to an hour.
Note: There might be 5 to 10 really well known, recognized top notch figure boot technicians (which includes boot fitting, sharpening, etc.)
in the whole world, who really know their stuff.
A few of them work privately. Most of those specialize in certain brands.
Some work for a boot manufacturer (some travel to scheduled locations, BTW), including former master custom boot makers, and people trained by them. They are often specifically good at one brand.
For the most part, the rest of the skate technicians aren't very good. Most are absolutely awful. They create a lot of pain and injuries, and destroy a lot of blades that they mount or sharpen, discourage a lot of skaters who could have been better and happier, and so on.
So, if you just go to the pro shop associated with your favorate rink, and are fitted by whoever happens to be on duty, the chances of getting one of the really good ones is microscopically small. If you weren't very careful to pick a good technician, it is nearly certain that your skate technician isn't one of the best, and is probably one of the really bad ones.
That's why a lot of people ask around from the best skaters and coaches at their rink, and nearby rinks, to see where those people go. Don't be discouraged, if it means driving all day to see the good ones. For some people, it means flying out to see one of the really great ones, sometimes out of country.
(That said, I probably don't know anything about your particular skate technician. I'm also not saying anything bad about Jackson skates. The upper level ones with plush linings look very good to me.)
I've talked elsewhere about how to modify or replace your insole, and do other things to and inside your boot, to make the fit more uniformly snug, and some other things. If it isn't snug enough at the ankles, or the boot only touches one part of your ankles, that might solve the problem. But with a boot this new, you should first try going through the fitter, and if that doesn't work (which it argueably hasn't in this case), the boot manufacturer. As soon as possible. Only if they can't make you happy should you consider modifying your boots - and only if you think it is worth the time, money and effort to try.
If you were underbooted, that isn't the boot makers fault. Nonetheless, I suggest you talk to them. Now. At the very least, you may get suggestions about skate technicians with better rates of success.
I'm curious: what blades did they put you in?
Jackson describes their boots at
http://www.jacksonultima.com/en/Index.aspx?category=7YlE13ayhuTPjN/sMIYMxg1A2B3C4D5E1A2B3C4D5EApparently your boots are at the bottom of the line of women's freestyle boots in terms of support.
At
http://www.northerniceanddance.com your boots are listed at $300 without blades, and $360 with them (what you paid!). That's only $60 for blades - from a
discount store. So that says something, both in terms of what that store thinks goes well with those boots, and in terms of the quality of the blades they included with them. That store sells Ultima Protege Blades for $160/pair, and lists them as able to handle double jumps (but not more). Most of the others in that approximate category are more expensive. E.g., MK Professional at $219. Remember, that is a
discount store. Very few pro shops are discount stores. AFAIK, none of the pro shops with top notch skate technicians are. In theory you are better off ordering your blades from a top notch boot technician, in case there is a problem, and to get a good mount.