A bog is a bog! Wouldn't you want your tune so that it doesn't bog down at all and just snaps off the line? After your initial tune is completed and all you have to really tune is the hsn for ambient temps, you should want your truck to idle for however long without loading up on fuel. I've only been doing this for 2 years so there's a lot i don't know still but that's what I went for when tuning my lsn. So please someone correct me if I'm wrong.
The lsn is what controls the amount of fuel getting to the motor at low speeds/idle, wouldn't you want just enough to keep it running and not to much that it's just loading up with fuel that you have to blip the throttle to clear it out? Now I understand that that's something that needs to be done during break in and initial tuning, but shouldn't really be necessary when the motor is broken in and tuned to optimal performance. But then again that's how I understood it and went for.
Then again the OP's problem could be something entirely different, I'm just stating what I would check first seeing as how he said he's never touched the needles and that's a symptom of a rich tuned motor.
P.S. I think I'm forgetting to add something, I'll edit later if I remember.
