HP 8220e problems

I am beginning to think that this burner is incapable of burning DAO with no pregaps, even thought the product specs at hp.com say that it can burn DAO. I am running Recordnow MAX 4.1, I specify DAO with no pregaps, when my burn is done EAC detects pregaps that 1.74 seconds long. When I burn from a global image I get the same problem. The source disc shows no pregaps. Has anyone had success burning DAO discs with no pregaps with this burner? What software did you use? I haven’t found any other software that works with this burner. I’ve tried Nero, Feurio, and EAC. Thanks for any help.