You can actually use this 2x minimum wager and 3, 4 x minimum wager rule against them, but in a more traditional way.
Say start out playing 1 spot of $25 and as the count grows you "act" pissed off after losing a hand and throw out chips in 2 or 3 spots, saying something about changing the cards. When you are informed that you have to wager multiple on the 2 or 3 spots, this rule has actually created a casino mandated spread for you.
However this type of thing isn't something you can use over and over if you play the same casinos or even rotation of casinos. Won't take much to catch on. You will likely be flat bet to 1 spot after a while.