A few casinos in Europe are offering a highly beatable variant of Caribbean Stud Poker. The pay out schedule is identical to the American game. The game offer two differences from the American version:

1.After the deal the player can change one or two cards for the price of one or two antes respectively. Afterwards the player decides to raise or fold his hand.

2.Players are allowed to show all their cards to each other and share information

What would be the optimal strategy for this game and what would be the player's edge?

I know a Griffin/Gwinn paper concluded that with conventional American rules sharing info about the matching cards to the dealer's upcard in a 7 players situation gave player edge of +0.7% and perfect play strategy with 7 players sharing info about their hands gave the player +2.3%.