MN, Re-install IRAI. I had the same problem. DarkWraith sent me the following message and it works.
"Lower the difficulty settings of IRAI until you are proficient at evading.
You can find the difficulty settings in \data\Scripts\AI\init.aix. Open the file with Notepad." You can make them so ineffective they won`t even follow you. you will see these two value 85 and 100 lower both numbers as much as you want then build them up slowly as you get more proficient.