Oh my bad for not reading carefully - I've never seen that happen with TD, seems odd that they would mess with your limit order price like that. 1010=20, I have both IB and TD accounts but I only use TD for long-term holdings, not for trading. I've always assumed since they are paid for order flow that their fills weren't going to be as good although I've never bothered to test the theory.
I've primarily traded NYSE stocks via Ameritrade and never had an issue. Some partial fills, but nothing on a consistent basis to get annoyed at. Remember, the MAJORITY of exchanges and market makers provide incentives for brokers to route orders to them. ( ie. rebates ).