Re: Shroud tension by feel
Sounds like you are a bit too loose.
I would suggest tightening them each at the same small increments (half turn at a time) - it does not take much - but do them one after another and back and forth to keep the mast as straight as possible. You could even grab your binoculars if you have them and stand far way on shore and try to sight how straight the mast is. Go back, do it again to get the correct balance and desired tension.
You could just go to the boats that are in tip-top shape and go sailing often and made yours the same feeling tension.
While you're at it, a cheap bristle brush along the shroud wires is good to clean out the dust and dirt, and also a bottle of turnbuckle lube (like $5 at marine store for a tiny bottle the size of crazy glue) and a few drops on each will make you feel confident about it before you start tightening things.
1985 Catalina 30 Std Rig "A Cenoura"