I have to ask, and I am not trying to be a smart ass, but how does a threadless headset loosen up? You are not talking about a threaded headset are you?
I always hear riders saying my headset loosened up, but they are running a threadless headset. Then they proceed to blame the quality of the headset and that is why they paid over a $100 for so and so headset.
Isn't a threadless headset held in place by the stem? You preload it with the top-cap, then tighten the stem bolts to hold everything snug. If the headset is loose, in my experience it has been one of three things. One, not enough preload. Two, stem bolts not torqued correctly, or the lower end headsets that might not have the best tolerances between parts or have plastic parts take a couple of adjustments.
The headset is loosening stuff is something that happened occasionally with threaded headsets, so long ago since I worked on one of those, or some marketing ploy by big brand names.
In my opinion, a headset, especially these drop in ones, can be one of the places that you save money on to spend on other parts that are crucial for performance.