I haven't tried tackling more than one swap at a time (here on NGA) either so don't have any advise other than if you have plenty of certain seeds, you could offer them in both swaps. Also, you don't have to list all of your seeds right away so if the time lapse allows between the two, you might be able to add more seeds once you see what people are wanting in each swap.. I'm quite sure I've read of several members that do both swaps, so maybe some will come forward with helpful insight.
