I think ME5's pay has a ceiling of ard $9k, dont think will hit $11k.
Early 30s hitting ME5 is definitely possible, even if not scholar.

ME4 working hours as a entry point for graduates depends very much on unit posted to.
it is common for the ME4s to work long hours. but it doesnt mean the higher ranks get to knock off earlier. thus, it would be good to check with friends on their actual working situation to know better.