Teaching low time students to make less than full spoiler deployments early on final, then leaving them alone so that they can concentrate a good landing that may not be in the exact desired spot may be a good way to start.

Most landing issues are the result of choices made much earlier in the pattern. Tighten up the instruction in the rest of the pattern.

There are too many variables for new students to adjust at the same time, so nail some of them down, airspeed, turn to base altitude, turn to final altitude. You can loosen those up later. Fine control of the spoilers near the ground shouldn't be attempted for awhile.

Tail first or main wheel landings, those are just style points, either can be done gently. Work on the decisions made earlier to result in some consistency that the students can handle without banging up the aircraft.