Winter Storage & Shroud Tension

[Theis]

Next year I will be wintering with Solsken's mast up (It freezes in this part of the world). What are the pros and cons of loosening the tension on the fixed rigging?

On one hand I have heard it said that the shrouds should be loosened because of contraction as it gets cold. But to counter that, the aluminum mast contracts more than the stainless rigging as it gets cold so that should create some slack.

Another point of view is that they should be left tight so they don't hum or vibrate as that will work the chainplates loose. Since the hull is on a rigid stand in the winter, with no give as it has when in the water, all vibration/jerking of the spar is taken up totally by the chainplates. Less slack means less vibration and spar movement.

Some people say you should never leave the spar up over winter as that stresses the boat as it shouldn't be stressed.

Does someone have some insight or should I compromise and take the middle of the road by doing all three options this winter?