Bruce,

Are these espaliered trees, and how many varieties do you have?

If they’re on wires and need to fill some space between each other, you can tie over the longer end-shoots to extend their reach. They’ll also better handle a snow or ice load if attached to wires.

Fruit spurs will also develop after winter pruning, just take the shoots back to two or three buds; the end bud will give the vegetative growth as the closer in buds will likely develop into fruit spurs.

On young trees, I’d wait to prune in early spring, before the sap begins to flow. Established apple trees (in my neck of the woods) may pruned anytime from now till spring --they’ve a good supply of stored nutrients that will easily balance out. Young trees, like yours, are still building their reserve - and if they fruited heavy this year, I’d let them rest through the winter.