The “twist” you’re talking about is usually referred to as mast rotation.
A general rule of thumb would be for the centerline of the mast to point somewhere between the outboard end of the rear crossbar and the leeward shroud.
Rig tension may affect mast rotation, but it’s really not the means of controlling mast rotation. Generally, your rig should be tensioned snug, so that the mast isn’t banging around, but not so tight that the mast can’t freely rotate from side to side. Note that when you pull in the mainsheet to sail upwind or on a beam reach, the mast will always bend somewhat, causing the leeward shroud to go slack. So rig tension really isn’t a factor a big factor in mast rotation unless it’s so tight that the mast can’t rotate downwind.
The interval for replacing shrouds is really dependent on how often you sail and what types conditions. Around every 5 years would be a very general ruleof thumb. But that could depend on factors like if you sail in strong wind, sail in salt water, sail frequently, leave the boat rigged with the mast up for long periods, etc. Inspect the rigging at least at the beginning of the season. It is also a good idea to replace all of the standing rigging (wires) at the same time (shrouds, forestay, bridles).
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