The best addition I added to the planter this winter has been the Mohawk Closing Wheels.
Half of my planter were Copperheads and the other Mohawks. Both of these wheels do a better job than the stock closing wheels, but the Mohawks have a distinct edge.
The Mohawks sealed the seed slot better and with less pressure while crumbling the top soil. The Copperheads mostly pushed the slot together which made it prone to open back up with lack of rain. The Mohawks never had that problem.
In heavy residue, the Mohawks always sealed the slot while I had to crank down the pressure on the Copperheads to achieve the same results and sometimes still not seal the slot.