I know this wasn't really the question but how do you know its not knocking under full boost? If you are just listening for knock at full boost you probably wont be able to hear it. I know my motor was knockin a good bit when MS first went in and I didn't know it did I hook the det cans up to it. From your last post it seems to me like you are expecting a loud audible knock when you get detonation.
Try and see if you can pinpoint the sound better, does it sound like its coming from the head or the bottom end. If its a tick then its more than likely lifter tick. If its a knock it could be a spun bearing. I doubt its a bearing if it hasn't thrown a rod yet after driving it like that for a few days.
Spun bearing -
http://www.youtube.com/watch?v=zNNMa...eature=related
Lift tick -
http://www.youtube.com/watch?v=C9Ukk...eature=related
Didn't think about this earlier but it could be injectors to, my injectors are loud as hell when the car is idleing. If you pop the hood you can hear then opening and closing so check that also. And about retuning the car. If the elevation has changed a lot then I would retune the car. If it has stayed about the same then you may be ok.