I don't know what kind of bankroll you're working with but you can reserve your entries in the contest you actually want, dump your updated lineups into one of the the secondary $2 Shot GPPs FD opens up after the main one fills, ctrl-click all the lineup edit buttons and import them over one at a time, and then hopefully if you have time, cancel the extra entries you have from dumping your new lineups in (if you want). I hope I made sense, that's what I do and it works quite well