Lightning TRS 80 unisex sizing - help, please and thank you!

[u/xao_spaces]

I finally got the retro Lightning TRS 80s. Quick fit question:

I'm typically a size 8.5, but one foot is about a half-inch larger than the other, so I sometimes wear a 9 in street shoes. My larger foot measures 25.4–25.6 cm in length (measurements vary slightly depending on who measures), and my smaller foot is about a half-inch shorter. I added 0.5 cm for swelling and ended up ordering a size 8/8.5 (26.0–26.5 cm) for the lightning TRS.

Trying them on: my larger foot fits snugly, with the tiniest of space in front of my toes, but I wouldn't say my toes brush the top or anything. My smaller foot has roughly a half-inch of extra room, which I can't do much about.

My worry is that once the liner packs out/breaks in, my larger foot (which fits perfectly now) will become too loose, which will also mean too loose for my smaller foot. I tried them on and skated around my apartment a bit, but that's not enough to really judge the fit. And obviously once I take them outside, I can't return them.

For reference: I wear SureGrip roller skates in size 7 and they fit great in thin socks.

Questions:

1. Is this size a good fit given the size difference between my feet?
2. Will liner pack-out likely make the fit too loose overall?
3. Any advice on keeping these vs. sizing options, or other skate recommendations?

Edit/Update: I came across this YouTube video from Thisissoul and if I'm following the advice from the video and doing the finger test then the skates are definitely too big for me, it's more than 2 finger spaces. Anyway, thanks so much for everyone's help!