Wow Trace... they really want to keep you, hey?
Can you maybe suggest (apart from the pay increase) that if you do accept the 5-12 role that you have plenty of back-up from your superiors so that you can't be harrassed to come in at other times? Maybe they could word up Mr. Arrogant (who should have some kind of consequence for the way he's being treating you) that it's not ok to call and harrass you and ask you to come in at other hours. You can't anyway... you'll have the kids at home so it's not like you can just drop everything and go in.

Sounds like it'd be a great idea financially for you if you could do the new hours.... but ikwym when you say family is more important than your role... and so is your emotional well-being.

What does your gut tell you? What does your DH think?