can anyone recommend some korean melodramas? 

things like Yellow Boots, The Promise,  Come Jang Bo Ri...

i'm a fan of all the makjang trops (wrongfully convicted, twins swapping places, etc.)

 they're such a guilty pleasure but i'm just not sure what to watch next ?

I don't see Money Flower on your list. It's a good one. And recently people have been raving about The Penthouse and Love (ft. Marriage and Divorce), which supposedly are very makjang and very entertaining--even though I haven't watched them.