What species of milkweed are you referring to? The tropical doesn't need any breaking of dormancy that I have found! I cold stratify my common & swamp MW seeds for 60-90 days in my frig because of our temps aren't cold enough or long enough here in North Texas for these species.
Where are you getting your info for your propagation? I just purchased a mini hothouse with heating pad to help with germinating seeds & would love to know how to use it better!

I'm getting my seed propagation information from Wash/Oregon Master Gardener program book. I'm also using California Master Gardener manual but W/O goes into more detail.

I have had this seed in refrig and now it is in package in the garage. It is pretty cool outside but my hot house stays around 40 during the nights. I have lots of narrow leaf seed but it is really dormant now so I thought this might work with soaking for 24 hr.