South point has 4 table game pits. For the purpose of this discussion we will label them SE, SW, NE, NW. The two northern most pits have no blackjack, mostly Asian games. The SW pit (closest to the buffet) is the primary pit that is always open. It contains several double deck and 6 deck shoe games, ranging from $10 min to $25 min, occasionally a $50 min or reserved table.
The SE pit is the auxiliary pit, opening at 11am, until whatever time at night they close it. It has 2 or 3 double deck games at $25 minimum.
All of my unusual variance has occurred in one pit, the SE "auxiliary" pit. Results in the main pit (SW pit) are very "normal". I am not suggesting anything by these comments, just sharing what my records show.
Additionally there is one other difference in the two pits concerning blackjack game and that is heat and the attitude of the pit. That SE pit where all of my unusual variance occurred has an entirely different feel to it. That sweaty atmosphere that South Point is know for is absent. The don't seem to care about much. They don't even request a players card. Make of that too what you may.
One other thing: I watched them open several tables at this second pit, looking to see if they spread the cards. They do....but the procedure is odd. The pit guy opens the cards and hands them to the dealer, who spreads them checking front and back. This is when a player looking can see that all cards are there. Next the dealer returns the card to the pit person who holding the cards in hand, quickly examines each card. Sometimes he stands right there doing so, sometimes he is walking around a bit, which actually takes the cards out of view momentarily. When the pit guy is done his examination, he returns cards to the dealer who washes and shuffles.
The point is this is backwards. The pit should check the cards BEFORE the dealer. Once the dealer spreads the cards for all to see, at no point should cards be taken out of view as they are. Technically they are still in view but depending on the pit guy moving around, anyone wanting to keep eyes on cards may have to go through some gymnastic moves.
Now let me be clear, at no time did I witness the removal of cards. But the cards were not within my view at all times after being spread and that remains a concern, if you are using the spread of cards to rule out any shenanigans.