I think give it more time, and eat slowly like you said. I have now, after getting on for 11 months primal, got used to understanding 'satisified' as in I have eaten enough good fatty protien rich food with loads of veg to meet my needs, and 'Full' as in my food bag is full. I am a big eater and always have been - eat when hungry, till satisifed only works if you work this way.
Try more IF, try WHEN - When hunger ensues naturally - eat when hungry, when-ever you are hungry - but only when you are sure you are really hungry, if a mug of fruit tea, or black coffee, glass of water or brushing your teeth still leaves you hungry, then give it 20 mins, then if you are chewing your arm - go get a steak. This should hekp you understand what real hunger feels like and break the 'meal time must eat' mind set.
If you are a 3 meals a day kinda person try skipping a differnt meal on different days - see how that makes you feel - that should give you more info on how you work too, for example - I have learned I don't need breakfast and rarely eat before midday now.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................