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Valve recession is due to the seats being too hard, not too soft. And normally if they're changing slightly it's not a big deal. With your larger gap of .008" they should do fine.
But, if they're not, and they keep receeding at .oo4 or .oo5" a thousand, then it's probably time to consider replacing or repairing the heads. Don't push it, or run it hard in hot weather and you'll do fine till you've saved up the cash to renew or replace.
It's been speculated that broken valves could be the result of worn valve guides, so keep that in mind.
Wanted: Dead, smashed, crashed or trashed gauges
BMW GAUGE REPAIRS - TACH*SPEEDO*CLOCK*VOLT METER *PODs & LIGHT BOARD*