The secret to a nice feeling throttle is to get everything spotless clean.
Everything, including the throttle cable.
Brake cleaner will work well.
Once cleaned well, use a penetrating type lube that evaporates just for a light coating. Something like wd-40 is a good choice here.
As far as moly and graphite...they will work well, but they can actually cause the action of the tube to feel a bit "gritish" or even a sluggish feeling. This will not be apparent at all when you are riding, just when you are in the driveway deciding how smooth it feels. A simple oil will feel better...BUT it will help to collect dirt and grime, which is what will degrade the feel more than anything.
Aftermarket tubes using bearings are another story, evaporating lubes with moly or teflon are best, as you have the life of the high-dollar part to also consider.
If a completely clean assembly doesn't work nice and snappy, then there is another problem.