NTRF, IQFEED and Amibroker

I am having huge differences between my actual trading results and the Amibroker backtest results. I believe that the differences are almost completely attributable to trades where IQFEED lists the exchange of the last trade to be NTRF which I understand to be the NASDAQ Trade Reporting Facility. I think those trades are not accessible to the retail trader. I know that IQFEED reports the exchange of the last trade because I see that on other software and IQFEED's own Time and Sales. My question is: Is there any way to exclude these trades from a given database using IQFEED? Alternatively, is there any other data feed that supports Amibroker where these trades can be excluded? Another alternative solution would be to find an order type at IB that would give me access to those trades.