15hrs 30 minutes is good. I'd be happy with that. I think the Battery settings shows major processes, while apps like GSam are designed to show more. The TouchWiz Battery settings can show much more details, though, compared to earlier TouchWiz versions as shown in your screenshots.
As for not matching 7%, its hard to tell from the screenshots. There may be a few more apps/processes further below in the main Battery screen that could help add up to 93%. It could also be possible that the Battery % remaining icon does some rounding, so it may not reflect minor % differences.