Andrew, I'm no expert - there are lots of people here that could give you a more knowledgeable answer, but here goes.
The thing with 'spring feeding' is to try to time a stimulation for the queen to start laying. Ideally timing the feeding to a little more than 6 weeks prior to your first bloom (giving yourself lots of new bees for the bloom).
Feed in small amounts to avoid the bees from filling up the brood nest leaving no space for the queen to lay.
You mentioned your bees are currently taking candy and that there is a small amount left. Sounds like they'll be ok with that. Unless they run out of the candy and your bloomtime is still a long ways away, I'd say you don't need to worry about addtional candy or syrup solution.
One thing you mentioned is that you reversed the boxes. Are the bees now a full boxes distance away from the candy? If it's still really cold in your area I think that could be a problem. If the bees were still tightly clustered, they may not be able to reach their food source anymore.
What does everyone else say????