Under the ice I always started out vertical and fairly large and looked in water where the most active fish generally could be found. One thing I found towards the end of my ice fishing was that if the crappies were going to hit hard on a vertical bait, I could use a plain old jighead of about 1/32 and a plastic generally associated with open water up to a couple inches and do just as well as any vertical jig/plastic would.
A lot of the water I fished in the winter was in the 30 foot range. I generally started fishing very high in the water column and worked my way down. I normally would not have to drop any deeper than the middle portion of the water column to find active fish….those that show on a flasher for five seconds or so.
If fish were present but would not hit the larger more aggressive baits I’d down-size the plastic, not the jig. If I had to fish any closer than 4 feet to the pile of neutral fish in the bottom I changed locations and started over.
I think if more people learned to target active fish and stay away from the bottom they’d do better in the quality of fish they caught. Find where the sweet spot is that feeding fish are patrolling and much larger and more aggressive baits will reward them with much larger fish and horizontal or vertical becomes less of an issue.