But all of this is conjecture. Valve lash doesn't normally go away that quickly.
Give it some time to get more data. And, who knows - you just might stumble across some low-mile or recently rebuilt heads for a song. These bikes are actually pretty rugged and have travelled loooong distances with worse troubles.
Don't worry yourself into a dither before you really know if something needs attention. Ok?
Also, I wouldn't consider doing my own heads even though I do most everything else. It's one of those things bordering on art and can trash an engine all too quickly if not done right. Especially the seats! Don't even consider them!
Wanted: Dead, smashed, crashed or trashed gauges
BMW GAUGE REPAIRS - TACH*SPEEDO*CLOCK*VOLT METER *PODs & LIGHT BOARD*