I also suggest something like a buffer. Instead of experience atrophying immediately, there's sort of a grace period that, without use, runs out before the experience starts going down with neglect. I suggest it is configurable to the skill, so that more advanced skills have a longer grace period. However, I think this might be a bit too much for we newbs.
Edit:
Alternatively, there can be a way that the script does this for us, e.g, the more advanced skills in a skill line have longer grace periods automatically.