As suggested, I tested a VACUUM FULL ANALYZE with 128MB shared_buffers and 512 MB reserved for maintenance_work_mem (on a 32 bit machine with 4 GB RAM).
My Apologies if my question seems redundant and something you have already discussed with list members, but why do you need to do a VACUUM FULL? have you not vacuumed for a while? or some special requirement which requires very aggressive space re-claim? Vacuum Full is also known to cause some index bloat at times as well. most systems i know run regular vacuums and had never required to run a vacuum full.
