Ive thought about this myself, but have written it off as more work than it worth.
With 25 open inventory slots, (30 - Rod and 4 Fishing clothes) you can carry 24 stacks of bait and as long as your script is autosorting and droping everything you dont need you should have no problems.
By adding in synthing of bait to the mix your adding one more thing that can go wrong with the script.
IMO, 24 stack of bait is plenty. Just take some time to re-synth before each session.
Edited by FFXI_Fisherman, 09 February 2004 - 05:17 PM.