Help determining values for max_fsm_pages, max_fsm_relations

I need some help tuning my free space map. I have about 275 GB of db's spread
across 3 DB servers. Unfortunetly, due to design and bandwidth issues, I am
not able to vacuum during business hours, and can only vacuum at night. I am
trying to get my free space map big enough to hold all of the pages needed so
I can do a normal vacuum most nights and not a full. Can someone please help
me understand how to see what I should set my max_fsm_pages and
max_fsm_relations to.

I'm running 7.3.4.

Thanks,

Chris

P.S.

Here is a sample output from my largest table:

INFO: --Relation public.largest_table--
INFO: Pages 467808: Changed 7982, reaped 16553, Empty 0, New 0; Tup 27257500:
Vac 230875, Keep/VTL 0/0, UnUsed 30151, MinLen 107, MaxLen 347; Re-using:
Free/Avail. Space 55977512/36230564; EndEmpty/Avail. Pages 0/37071.
CPU 9.22s/2.27u sec elapsed 150.27 sec.
INFO: Index largest_table_pkey: Pages 140132; Tuples 27257500: Deleted 230875.
CPU 5.35s/7.81u sec elapsed 134.08 sec.
INFO: Rel largest_table: Pages: 467808 --> 463676; Tuple(s) moved: 113607.
CPU 1.54s/6.39u sec elapsed 88.06 sec.
INFO: Index largest_table_pkey: Pages 140132; Tuples 27257500: Deleted 113607.
CPU 4.10s/2.01u sec elapsed 86.46 sec.