Hand 4 is one of those ones where I'll sometimes take a shot at and others will check. In this case I wasn't sure what I'd do to a raise so I decided to let it go but can see the reason behind taking a shot at it.

Hand 6 is meh, I hate AJ and you're right there.

Hand 8 is pure unadulterated tilt + opponent having crappy stats and been showing trash, honestly put them on either a resteal or AK and wanted to put them to the test figuring they'd call with anything based on their previous action. You're right though, if he reraised me I'd be getting it in anyway but a lesser bet would have been a better play against a more rational opponent.