Frankly, if we look at PF alone there's a massive disconnect in views with regard to how slaves are treated.
i.e., some sources describe slaves being physically mistreated, abused, constantly denegrated, etc...
Other sources show slaves in places of extreme trust, or working without immediate overseers lashing them every time they pause from their work, even living lives that, while inherently unequal, are not prison-camps-IN-SPACE.
Protip: You don't place people in positions of extreme trust and autonomy and simultaneously treat them like absolute shit. They develop nasty habits of sabotaging things, even performing suicidal actions (say, chucking a wrench into the reactor core or whatever) just to screw you over.
Second protip: If you are trying to religiously convert an entire subjugated race, you do not ostracize every single member of that race. You need to "make friends" with a significant percentage of that race to ever have a hope of divesting them of their initial cultural paradigm - that is, opposition to you, their captors.
Evidence from tip #1 suggests that Amarr have realised tip #2 long ago. Ergo, it's highly unlikely that the majority of a slave-crew aboard an Imperial Navy warship - if any at all - are maltreated, constantly beaten-down, etc etc.