Gunparts, of NY, might have your spring. Also, if the gun is particularly dirty and not properly lubed, you might experience light strikes. Make particularly sure that there's no gunk that's preventing the hammer from solidly passing through the hole in the frame.
On the other hand, you might not have seated your primers deaply enough.
Just checked my Brownell's. They list a mainspring for a DSII. I don't know if that's a leaf or coil spring, but you might call Brownell's and ask for their Tech Support staff. Their part number is 160-000-023, Colt # SP30055.
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