there is no best option for that lol..
when u recheck torrent u will see if size i correct..sometimes can happend that recheck stop on 99,9% because of some error on nfo:)
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if you want to seed the same stuff to different public trackers /with one torrent file/, i think it is possible just by adding the trackers' announce information.
but, if you want to do this with private trackers, it is not possible, because your passkey is different on each tracker. nevertheless, you will be able to seed, but with two /3, 4, etc/ different torrent files /the number depends on how many trackers you want to seed to/.