I bought the Tecnica Rival X8 last year. I'm a very experienced skier (CSIA level 2, since 1995, taught till 04, now ski). The fellow that sold them to me is a very experienced fitter, good friend, and did every pro deal i ever had done. Sold me every kids ski I ever bought and every ski jacket i ever owned. He really felt the boot would be good. I bought it in Ontario. I wore it my first time away from the hill. It had a flex of 75 flex adjusters and could be lower. It has an even softer flex with no adjusters in. I had none in. I crushed the boot. It was so soft it bent and flexed with the energy of my ski coming back up from the snow. Though it felt snug enough in store, i thought it would be a good boot for when out on the snow with my grand daughter all day etc...(second boot, to be more comfy), within too runs I felt it was already packing out and too large. I took it off. I eventually sold it on Craigslist this year to someone it fit and was low intermediate who could likely make good use of it for $100.00 ( a steal for a boot that did two runs). About half what i paid. I should have skied it in Ontario and could have taken it back to him, I didn't have the heart to tell him how it had worked out so I just bit it.
I suspect it may have packed out quickly and be too large or be too soft for advanced ski techniques where you are rolling the ankle and building energy, or, a combination of the two together. Your boot is an 65 Flex in the Rival X7 and the flex on the Women's Tecninca is no where near the stiffness levels of the same number in a women's head boot which I now wear. I hope you can work with the fitters at your shop, but for myself, I'm so happy i went and got a different boot. I'm in the Head Dream Thang 9 now for comfort, flex and warmth and it works well, I can keep it on all day and snow plow with the kids but still gives precision information to my edge when I'm carving the slalom turns.