Tanner,
1. Rigger humour.
2.So the twists remain in the purchase when open?
3.But there may still be a foul and unfair lead to one of the sheaves in one of the blocks, this is all it takes to impart a twist to the line as it travels.
4.See 3. above.
5. Broadly, yes. try to get the parts travelling over the sheaves in opposite directions.
ie up and away from you in one top sheave, down and across in one bottom sheave, up and towards you in one top sheave - repeat as needed to fill the purchase.
6. Big blocks, correct size line, fair leads always. Pictures will help. Also whose blocks are you using?
7. Replace the twisted line. Make sure you actually get 3/8 " Manufacturers sizing romps wildly from one end of the tolearance to the other with no regard for consistency. Take a block in to the chandlery and try the line for fit.
If the boat is the size you say, and the rig divided in two, you may be able to get away with 5/16 in the same blocks.
Joe.
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