I have wire runners with a 4:1 tackle near the bottom on my Hallberg-Rassy 40. The inner forestay is removable.
To get any reasonable tension on the inner forestay I have to crank down as hard as I can on the forestay clip and then tension the appropriate runner.
When tacking I have not had to move the leeward runner back to the shroud; easing it a good bit keeps it away from the boom and the main sail. Whether you can do that or not depends on how long your boom is, how much roach you carry, and where you land the runners.
Once set up, I have found the runners contribute to pointing higher when flying only the staysail.
sail fast, dave
S/V Auspicious
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