HYB: help - chilled seeds, germination

One more cross has started to germinate in the fridge. The seeds have all been in the fridge for 5 months now.
For those of you who have experimented with refrigerator chilling, how much longer should I leave them in the fridge?
Or should I pot the rest and put them outdoors to experience intermittent chilling?
If I do that, I will probably bring them into the sun porch if it gets into the low 20s F or colder.
If it's just cumulative chilling that triggers germination, I could leave them in the fridge, but if the remaining genetic mixes are waiting for some alternating temperatures, they might not ever germinate.
Plus these guys may need to get a good rinsing to remove additional inhibitors un-related to chilling. 

What to do...
Maybe I should soak them all for a few days with changes of water, then put them back in the fridge for a few more weeks, then pot them?? A lot of fussing around, but only about 5 pods left. That's manageable. 
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
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