Hi Robin
We have a fairly standard approach to this sort of picture here.  Mothers
are encouraged to feed from one side only for every feed in 4 - 6 hour
blocks or until that breast feels well drained.  Then at the next feed
change sides and only feed from that side until it feels well drained.
Initially the unused side may need to be expressed just enough to maintain
the mother's comfort but the goal is to reduce the stimulation of the
breasts. There is a description of the mechanism of lactose overload here
http://www.breastfeeding.asn.au/bfinfo/lactose.html 
This is more of an art than a science.  I have a friend whose oversupply was
so extreme and so persistent that for 12 months she fed from one side during
the daylight hours and the other at night.  Sometimes she even had to feed
from one side for 24 hours and then the other side for 24 hours.  As she was
an experienced feeder she was confident in managing her oversupply.
Also some mothers find that a single complete pump out (emptying both
breasts with a pump once) and then block feeding as described above is more
successful at 'resetting the system'.
Good luck
Nina Berry 
Australia

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