If your playing with a six deck shoe and the casino is cutting at deck and a half, how much of an edge can you really get? Even if your the only player.
Depends on your betting spread and table rules. But at a deck in a half you're probably looking at around 0.75% for a pretty standard ruleset [1]
The casino I usually play at cuts at under a deck and also has a side bet (Over Under 13) with even better odds than the blackjack game if you use a different count. It can also be gamed many other ways (they give $5 and $2.5 chips, but don't pay quarters, so if you bet $7.50 for your hand, they pay $11.50, essentially improving your odds even further).
The casino I usually play at cuts at under a deck and also has a side bet (Over Under 13) with even better odds than the blackjack game if you use a different count. It can also be gamed many other ways (they give $5 and $2.5 chips, but don't pay quarters, so if you bet $7.50 for your hand, they pay $11.50, essentially improving your odds even further).
[1] https://www.qfit.com/book/ModernBlackjackPage309.htm