one other point
If you play SD games, and they are dealt to RO6 or RO7, then playing more than one hand can improve your EV. For example, heads-up with RO6, will see 10 hands dealt, five rounds to you and the dealer, for 26 cards total or 50% penetration. Spreading to two hands makes 4 rounds to 3 players (counting the dealer) which is almost 6 more cards dealt. Spreading to 3 hands doesn't improve things further as you get 3 rounds to 4 players counting the dealer, which is no better than 2 hands.
The extra penetration at SD can make a significant difference since it increases by more than 10%.
Of course, normally you use 2 X .72*bet, which means you bet slightly less than 1.5X the money, but eat 1.5X the cards, which is slightly worse, but the extra penetration offsets that nicely and then some.