problem

I have some problem.IN my hometown are these conditions.
6 Decks, S17, DA2, DAS, ENHC, ES10,3 split
Penetration is over 90%(half a deck).Only problem is that we have 5 spread.
At first we fought with my friends that this game is beatable every position.
But we have experienced 3 lossing session in a row(20hours playing)

WE worried about game beatable.Isnt it beatable at all?
What edge we have?