I think the sun exposure they are getting is fine and their foliage is rather spindly to begin with. Your bulbs may need more time to get established and build up their reserves in order to bloom well. Sometimes bulbs are picky and do well in one spot in the yard but not another. Trial and error is the best way to find them a good spot. I would give them another spring to see if they are going to perform and if not them move them to another spot.
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