WELLFLEET — The addition of two big screens brought the Bakers Field crowd closer than ever to the action on the stage at the finals of this year’s OysterFest Shuck Off — SPAT’s 22nd. Each one of the 11 contestants started with 26 oysters. They then each rejected two that somehow looked especially recalcitrant — a decision that depends on the shucker’s approach to the oyster, said SPAT board president Nancy O’Connell.