I have the same foot measurement as you. It's a shame that so many bootfitters match the buyer's foot length and ignore the "volume," which is that measurement you are talking about. They also sometimes ignore the width of the foot, but not as often as the volume. It's almost never mentioned. It took me 7 pairs of boots before wising up on this issue.
Tecnica Mach 1 LV (low volume) may do it for you. It has worked for me. But the instep measurement was not the only factor that led me to buy that boot. Your feet most likely have other needs as well, and they probably won't match mine.
In any event, you need a low volume boot. A race plug might do it, or it might not. If you go to a bootfitter who works with racers in a shop that caters to race teams. that bootfitter will most likely know how to fit you well and can talk about the pros and cons of race boots.
Race boots are known to be cold. If that's an issue for you, discuss it with the boot fitter. They also tend to have narrow toe boxes, which may need to be ground/punched out for your toes if yours are wide rather than narrow. This will make the plastic thin in that area, and its potential for blocking cold will be diminished. The punch may also create a gap where the two folds overlap at the front of the boot; thus all the duct tape on that area among young racers to keep the wind out.
Injected liners are a possibility. Boot Doctor makes one that has some "give" and is said to not be so cold as the more rigid injected liners. I thought of buying this liner when I got my brand new Tecnicas, but opted for Zip Fit liners instead. I never used the liners that came with the boot. In retrospect, I may have done better with the Boot Doctors, but the Zip Fits are doing OK.
Everyone's feet are different. A bootfitter who talks with you and takes time and knows things and treats you seriously can be a most valuable friend.
Best of luck.
So, I have feet and ankles that are as wide as a piece of plywood shaped like a perfect "L", and they are 83mm wide. Lange boots have a higher instep compared to others, so if you also have an "L" shaped foot/ankle, then Lange might not work. MAYBE some of the newer Lange race boots might. I was not able to try any of those on, as the shop would have to order them. The issue with race boots is finding a shop that has them in stock to even try on.
My feet SWIM in most off-the-shelf boots/liners. It's stupid. And annoying. I went the Jr race boot route with a Head B5 RD, and the fit with the stock liner was awesome, BUT they had so much forward lean and so much ramp angle, they threw me so off balance that I struggled mightily all last season on them. I even went with the Boot Doc foam injected liners mentioned above, and they snugged up the fit even more (holy heel hold!) and the Comfort Foam liners are definitely not too stiff, but even with toe lifts and as level of bindings as I could find, I just couldn't overcome the ramp angle and cuff angle of those boots.
My fitter put me into a Tecnica Mach 1LV 95 (as I highlighted above) and we moved my Boot Doc liners into them, and voila! What a fit. The instep is almost too low, yet my toes have good wiggle room, and the ankle is locked down. Apparently, the BD liners CAN be moved to a new shell if the shell shape is similar enough. I was so happy about that!
FWIW, the stock liner in the Tecnica did not work for me at all. I've never liked stock Tecnica liners, which makes it kind of ironic that their shells fit me so well. I've also had Tecnica Inferno Flings that I used Zipfit liners in.)
The only boot that wasn't a race boot that fit me like a glove off the shelf were Salomon Xmax. But, once the liners packed out, I was slopping around in them. Plus, the toe box was really small. Also, Salomon boots aren't very compatible with after-market liners for some reason. (My fitter isn't the only one who has told me this.)
The bonus of the Boot Doc liners is they don't pack out. They just don't. Pretty awesome product. I prefer them to the Zipfits because the Zipfits I felt got almost too rigid once they cooled off after heating them overnight in the hot bag, and my ankle would start slipping around despite how well they molded to my feet in the morning. Not sure how to explain that. I also didn't care for the tongue in them at all--to thick and the whole upper cuff of that liner made me feel disconnected from the cuff of the boot.
Good luck. Low-volume feet are the pits when it comes to ski boots.