One question: Do you prefer an IOC-Order for day trading? The problem using limit orders only is when you don`t get filled immideately and the stock comes back your limit order ist still valid and you get filled. If you don´t want to get filled in a declining stock you must care of cancelling your order. What i have noticed is that IBs mosaic view does not allow you to set up ioc orders. Only the classic view offers this. This told me IBs support. The reason for this wasn`t eplained to me ;-)
Your expectation of pricing going your way with every tick is not a healthy expectation. You have to assume that you might be wrong a little before being right.