So depending on the time of the year I would say there are 3 stages to each ice fishing season: 1-early ice, 2-mid January Lull, & 3-late ice.
These are my experiences.
1. early ice fish seem to be up on the weed flats and very active. Northern Pike are territorial fish so moving around can be beneficial in trying to locate some bigger fish. but if you are on fish, don't chase fish.
2. Mid January Lull the oxygen levels seem to go down on the flats and the bait fish and other fish seem to move into deeper water. at this point I try to target points or ledges closer to the deep water areas. even a channel passing through a weed flat can produce more fish as a travel corridor.
3. Late season I would try to locate some of the "spawning Bays" and fish in them or very near them. Fish move back up onto the weed flats late season because new life and higher oxygenated levels pull bait fish back into these areas and fish are getting ready to spawn. usually areas with stream inlets are areas that Pike will likely run to spawn. Areas with cattails can be a good place to look as that usually means an area with a soft bottom that they can spawn. CAUTION: fishing near flowing water can create unsafe ice.
I usually like the 5-8fow range myself. Don't really ever fish anything over about 15fow. if you do move into deeper water I would suggest trying a bait about 3ft off the bottom and a bait high in the water column, maybe right below the ice or 5ft below.
Talking to some of the other local fisherman can also be very helpful for your specific lake, if they are willing to share. DCNR or fish wardens can also give you info to how other fisherman are doing and where.