Good catch. Both that and the water height are pretty much exact to the spec sheet with the fill tube into the overflow spout. Honestly I didn't have them installed and use them long enough at the lower level to compare too much — I was incorrectly holding the lever down longer for a longer...
tl;dr: New to TOTO and CST776 series — unsure if water level is appropriate and whether fill tube should stay positioned as it is out of the box.
Now for the lengthier version…
I just recently purchased three CST776CSFG's to replace Mansfield Alto 160's (good riddance!), and I found it...