A split stay is a bit of a hassle, particularly if you've got young kids, a large group, or anyone in the group with a less than go with the flow attitude. For a short 5-night trip, the split isn't worth it imo unless you have a pressing desire to stay at both resorts for their own sake, which doesn't seem to be the case here.
In your position, I'd try to find a resort that I would enjoy and where I could comfortably afford to stay all five nights. Maybe a standard view room at AKL, which is cheaper than Boardwalk yet still deluxe?