Interesting that you mentioned that because I have noticed the same thing in BAC lately. I've had to play with different quantities to find the "sweet" spot as many orders are 5K shares or less so I too find it difficult to have limit orders filled with 10K + shares regardless of which MM route I push the trade through. Most of my blocks don't get filled until the tick drops or increases depending on which way I'm playing it. Depending on how much capital you play with to flip you could always trade a large enough block to catch the profit with a market order which I've done before. It is risky if the PPS is moving quickly or either side has minimal volume so you don't push it down or up with your order but if you can secure at least a .01 profit regardless of the tenth or hundredth deviance a market order would be profitable with a trade rate of 100%.
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