Scanning, you see. The lab will auto-correct the contrast and colour to what they (or the automated scanner) think looks right, which may or may not have anything whatsoever to do with the native appearance of that film.
To know what it actually looks like, you need to print it optically to RA4.
The Frontier scans to a certain fixed contrast (like RA-4 paper) and DOES give you contrast like you would have in a print, it is NOT like other scanners where it gives you the option of levels adjustment (to expand or contract contrast) most scanners scan extremely flat at auto corrections, the exception I've seen is the Flextight scanning b&w, the default look (if you do it via it's software and processing rather than raw) is like printing on a middle grade.
Anyway increasing or decrease brightness on the Frontier corrections just increases or decreases dMax like printing, it doesn't expand or contract contrast, the images above are not exposed for lowered contrast for printing, therefore will not have lowered contrast via the Frontier either, they're exposed for higher contrast (underexposed even). If the lab printed with less density on the frontier (more brightness) the blacks would be -grey- not black.
You do not get to alter/correct gamma on the frontier like you can with other scanners - you correct gamma by exposing correctly.
Eg it would just do this:
As opposed as to actually getting to alter the gamma, which gives you this if open it up
As you can see, it's not a lab deciding to print this way, or automatic correction issue. It's a user issue (exposure).
Imho I don't like 400H that much (Colour is fine, do like the colour), last time I shot some, it dropped shadow detail it shouldn't have (flat lighting, dark hair on a model, correctly exposed), very very grainy as well compared to Portra 400, and not sharp at all (6x7cm). At that time Portra 400 wasn't out (the new one), so I was shooting Pro 160S instead of 400H, which imho is probably faster than 400H.