Just cut them back to the size you want. Aucuba responds well to pruning and can be controlled easily.

If you want more, the cuttings root easily also.

George

I have moved some that large in the past, but can't remember the season that they were moved. If you decide to move them, take off about one-third of the foliage prior to the move and dig as large a rootball as you can handle. Water in well afterwards and they probably won't even know they had been moved. I have a row of them beside a garden path and have to remove a large amount of foliage each year, that intrudes into the path. They recover quite rapidly. In addition to rooting the cuttings, they produce fruit (mine are loaded now) which can be sown to produce new plants.
Rb

It's not advised, any longer, that the top be removed to compensate for root loss during transplanting. Recovery (which means the regrowth of lost roots) is nearly entirely fueled by the energy resources manufactured in the leaves.

Pruning not only decreases the photosynthesizing surfaces (thus, less energy), but forces the plant to give up other energy resources (stored) so that it can grow new leaves to replace those that have been removed!

That makes pruning at this time a double whammy. A bad double whammy.

On your zone I would move the plants in the fall. They will have the mild winter to recover and establish themselves before the summer heat comes along. However, check with an extension agent in your area to make sure.