I respectfully disagree! With a little work, you can get a perfect fit.
As I've said elsewhere, I am using too-big boots (size 8, instead of size 6 - 6.5), by cutting new thick insoles out of carpet foam. I have carefully cut them to shape, and they go around my feet where I need them to as well as below them, and I did a heat mold, to create a very precise fit to my feet. Plus I wear thick cushy fleece socks (2 socks on the smaller foot), which act like a plush liner, and makes the fit absolutely perfect. The result is much more comfortable, uniformly snug (except at the toes, which I like loose), and is a better fit than I've ever had before, even with custom boots - partly because my foot shape doesn't work with any stock boots, partly because my old custom fit was badly done.
My toes tend to be cold - the closed cell carpet foam and thick socks solves that completely. Use tape or maybe open cell foam instead of closed cell foam if you have warm sweaty feet instead of my cold feet.
I also sized my blades to my feet (i.e., the size that smaller boots would have used - they were sized to my old custom boots), not my boots, and carefully mounted the blade sweet spots under and slightly ahead of the balls of my foot, instead of flush with the front of the front mounting plate, which works very well.
I love the results.
One problem remains: They are heavier than smaller boots. However, you are closer in intended size, so weight may not be an issue.
(A second problem is that the boots are too stiff, but presumably that doesn't apply to you.)
At my web page (below) you will find instructions for modifying boots to fit. But basically, start with carpet foam, and cut to shape until everything is uniformly snug, then do a new heat mold.
If you hate thick socks, that is another matter. If your boots heat mold well, and you tie tight enough, you
might manage without them. I like socks.
I don't know whether a snug fit is good enough to make socks not slip on high level jumps, because I barely jump. You may have to lace very tight.
However, if money is not an issue, then of course you should get new boots to make you happy, whether you need them or not. Retail therapy!